diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/AlignedDynArray.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/AlignedDynArray.h
index 260653f83c01ae18401d83eedb43211d296bfacc..83a41352d7d85d33a9164d33ab4caa92d7d02be8 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/AlignedDynArray.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/AlignedDynArray.h
@@ -20,7 +20,7 @@ template<typename T, size_t Alignment>
  * https://en.cppreference.com/w/cpp/memory/c/aligned_alloc
  *
  * Provides
- * - Additional RAII functionality 
+ * - Additional RAII functionality
  * - Default initialization of elements
  * - Initialization with copies of elements with value value.
  */
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/AlignedDynArray.icc b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/AlignedDynArray.icc
index 51e68450d5c450f326d0a57af1b149f73c39b913..d42c8583b3ae9ebf9564f5ef327686a854a90c4e 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/AlignedDynArray.icc
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/AlignedDynArray.icc
@@ -19,7 +19,7 @@ inline AlignedDynArray<T, Alignment>::AlignedDynArray(size_t n)
 {
   const size_t bufferSize = n * sizeof(T);
   m_buffer = static_cast<T*>(std::aligned_alloc(Alignment, bufferSize));
-  std::uninitialized_default_construct(m_buffer,m_buffer+m_size);
+  std::uninitialized_default_construct(m_buffer, m_buffer + m_size);
 }
 
 template<typename T, size_t Alignment>
@@ -29,7 +29,7 @@ inline AlignedDynArray<T, Alignment>::AlignedDynArray(size_t n, const T& value)
 {
   const size_t bufferSize = n * sizeof(T);
   m_buffer = static_cast<T*>(std::aligned_alloc(Alignment, bufferSize));
-  std::uninitialized_fill(m_buffer,m_buffer+m_size,value);
+  std::uninitialized_fill(m_buffer, m_buffer + m_size, value);
 }
 
 template<typename T, size_t Alignment>
@@ -88,7 +88,8 @@ inline T& AlignedDynArray<T, Alignment>::operator[](const std::size_t pos)
 }
 
 template<typename T, size_t Alignment>
-inline const T& AlignedDynArray<T, Alignment>::operator[](const std::size_t pos) const
+inline const T& AlignedDynArray<T, Alignment>::operator[](
+  const std::size_t pos) const
 {
   return m_buffer[pos];
 }
@@ -113,4 +114,3 @@ AlignedDynArray<T, Alignment>::cleanup()
 }
 
 } // namespace GSFUtils
-
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/ForwardGsfFitter.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/ForwardGsfFitter.h
index f198aa219a59a9166c80da1d964ba53d28ba8a4e..91b98ac3fc2f1876b5ac7c1a79e9704cfe6079f8 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/ForwardGsfFitter.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/ForwardGsfFitter.h
@@ -9,7 +9,8 @@ begin                : Wednesday 9th March 2005
 author               : atkinson
 email                : Tom.Atkinson@cern.ch
 decription           : Class definition for the forward GSF fitter
-********************************************************************************** */
+**********************************************************************************
+*/
 
 #ifndef TrkForwardGsfFitter_H
 #define TrkForwardGsfFitter_H
@@ -52,33 +53,37 @@ public:
       - Configure the extrapolator
       - Configure the measurement updator
       - Configure the RIO_OnTrack creator */
-  virtual StatusCode configureTools(const ToolHandle<Trk::IMultiStateExtrapolator>&,
-                                    const ToolHandle<Trk::IMultiStateMeasurementUpdator>&,
-                                    const ToolHandle<Trk::IRIO_OnTrackCreator>&) override final;
+  virtual StatusCode configureTools(
+    const ToolHandle<Trk::IMultiStateExtrapolator>&,
+    const ToolHandle<Trk::IMultiStateMeasurementUpdator>&,
+    const ToolHandle<Trk::IRIO_OnTrackCreator>&) override final;
 
   /** Forward GSF fit using PrepRawData */
   virtual std::unique_ptr<ForwardTrajectory> fitPRD(
     const PrepRawDataSet&,
     const TrackParameters&,
-    const ParticleHypothesis particleHypothesis = nonInteracting) const override final;
+    const ParticleHypothesis particleHypothesis =
+      nonInteracting) const override final;
 
   /** Forward GSF fit using MeasurementSet */
   virtual std::unique_ptr<ForwardTrajectory> fitMeasurements(
     const MeasurementSet&,
     const TrackParameters&,
-    const ParticleHypothesis particleHypothesis = nonInteracting) const override final;
+    const ParticleHypothesis particleHypothesis =
+      nonInteracting) const override final;
 
   /** The interface will later be extended so that the initial
    * state can be additionally a MultiComponentState object! */
 
 private:
   /** Progress one step along the fit */
-  bool stepForwardFit(ForwardTrajectory*,
-                      const PrepRawData*,
-                      const MeasurementBase*,
-                      const Surface&,
-                      MultiComponentState&,
-                      const ParticleHypothesis particleHypothesis = nonInteracting) const;
+  bool stepForwardFit(
+    ForwardTrajectory*,
+    const PrepRawData*,
+    const MeasurementBase*,
+    const Surface&,
+    MultiComponentState&,
+    const ParticleHypothesis particleHypothesis = nonInteracting) const;
 
 private:
   /**These are passed via the configure tools so not retrieved from this tool*/
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GaussianSumFitter.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GaussianSumFitter.h
index b9786dd38b912abc355cd80dab98b7c7002da0ef..f200f6049d0fbe6c72b4619d4ca3149d5f6484bf 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GaussianSumFitter.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GaussianSumFitter.h
@@ -10,7 +10,8 @@ author               : amorley, atkinson
 email                : Anthony.Morley@cern.ch, Tom.Atkinson@cern.ch
 decription           : Class for fitting according to the Gaussian Sum Filter
                        formalisation.
-********************************************************************************** */
+**********************************************************************************
+*/
 
 #include "TrkEventPrimitives/PropDirection.h"
 #include "TrkEventUtils/TrkParametersComparisonFunction.h"
@@ -62,68 +63,88 @@ public:
 
   virtual Track* fit(const Track&,
                      const RunOutlierRemoval outlierRemoval = false,
-                     const ParticleHypothesis particleHypothesis = nonInteracting) const override final;
+                     const ParticleHypothesis particleHypothesis =
+                       nonInteracting) const override final;
 
   /** Fit a collection of 'PrepRawData' objects using the Gaussian Sum Filter
-      - This requires that an trackParameters object be supplied also as an initial guess */
+      - This requires that an trackParameters object be supplied also as an
+     initial guess */
   virtual Track* fit(const PrepRawDataSet&,
                      const TrackParameters&,
                      const RunOutlierRemoval outlierRemoval = false,
-                     const ParticleHypothesis particleHypothesis = nonInteracting) const override final;
+                     const ParticleHypothesis particleHypothesis =
+                       nonInteracting) const override final;
 
   /** Fit a collection of 'RIO_OnTrack' objects using the Gaussian Sum Filter
-      - This requires that an trackParameters object be supplied also as an initial guess */
+      - This requires that an trackParameters object be supplied also as an
+     initial guess */
   virtual Track* fit(const MeasurementSet&,
                      const TrackParameters&,
                      const RunOutlierRemoval outlierRemoval = false,
-                     const ParticleHypothesis particleHypothesis = nonInteracting) const override final;
+                     const ParticleHypothesis particleHypothesis =
+                       nonInteracting) const override final;
 
   /** Refit a track adding a PrepRawDataSet - Not done! */
-  virtual Track* fit(const Track&,
-                     const PrepRawDataSet&,
-                     const RunOutlierRemoval runOutlier = false,
-                     const ParticleHypothesis matEffects = nonInteracting) const override final;
+  virtual Track* fit(
+    const Track&,
+    const PrepRawDataSet&,
+    const RunOutlierRemoval runOutlier = false,
+    const ParticleHypothesis matEffects = nonInteracting) const override final;
 
   /** Refit a track adding a RIO_OnTrack set
-      - This has no form of outlier rejection and will use all hits on orginal track...
-        i.e. very basic impleneation at the moment*/
-  virtual Track* fit(const Track&,
-                     const MeasurementSet&,
-                     const RunOutlierRemoval runOutlier = false,
-                     const ParticleHypothesis matEffects = nonInteracting) const override final;
+      - This has no form of outlier rejection and will use all hits on orginal
+     track... i.e. very basic impleneation at the moment*/
+  virtual Track* fit(
+    const Track&,
+    const MeasurementSet&,
+    const RunOutlierRemoval runOutlier = false,
+    const ParticleHypothesis matEffects = nonInteracting) const override final;
 
   /** Combine two tracks by refitting - Not done! */
-  virtual Track* fit(const Track&,
-                     const Track&,
-                     const RunOutlierRemoval runOutlier = false,
-                     const ParticleHypothesis matEffects = nonInteracting) const override final;
+  virtual Track* fit(
+    const Track&,
+    const Track&,
+    const RunOutlierRemoval runOutlier = false,
+    const ParticleHypothesis matEffects = nonInteracting) const override final;
 
 private:
   /** Produces a perigee from a smoothed trajectory */
-  const MultiComponentStateOnSurface* makePerigee(const SmoothedTrajectory*,
-                                                  const ParticleHypothesis particleHypothesis = nonInteracting) const;
+  const MultiComponentStateOnSurface* makePerigee(
+    const SmoothedTrajectory*,
+    const ParticleHypothesis particleHypothesis = nonInteracting) const;
 
   //* Calculate the fit quality */
   const Trk::FitQuality* buildFitQuality(const Trk::SmoothedTrajectory&) const;
 
 private:
-  ToolHandle<IMultiStateExtrapolator> m_extrapolator{ this,
-                                                      "ToolForExtrapolation",
-                                                      "Trk::GsfExtrapolator/GsfExtrapolator",
-                                                      "" };
-  ToolHandle<IMultiStateMeasurementUpdator> m_updator{ this,
-                                                       "MeasurementUpdatorType",
-                                                       "Trk::GsfMeasurementUpdator/GsfMeasurementUpdator",
-                                                       "" };
-  ToolHandle<IRIO_OnTrackCreator> m_rioOnTrackCreator{ this,
-                                                       "ToolForROTCreation",
-                                                       "Trk::RioOnTrackCreator/RIO_OnTrackCreator",
-                                                       "" };
-  ToolHandle<IForwardGsfFitter> m_forwardGsfFitter{ this,
-                                                    "ForwardGsfFitter",
-                                                    "Trk::ForwardGsfFitter/ForwardGsfFitter",
-                                                    "" };
-  ToolHandle<IGsfSmoother> m_gsfSmoother{ this, "GsfSmoother", "Trk::GsfSmoother/GsfSmoother", "" };
+  ToolHandle<IMultiStateExtrapolator> m_extrapolator{
+    this,
+    "ToolForExtrapolation",
+    "Trk::GsfExtrapolator/GsfExtrapolator",
+    ""
+  };
+  ToolHandle<IMultiStateMeasurementUpdator> m_updator{
+    this,
+    "MeasurementUpdatorType",
+    "Trk::GsfMeasurementUpdator/GsfMeasurementUpdator",
+    ""
+  };
+  ToolHandle<IRIO_OnTrackCreator> m_rioOnTrackCreator{
+    this,
+    "ToolForROTCreation",
+    "Trk::RioOnTrackCreator/RIO_OnTrackCreator",
+    ""
+  };
+  ToolHandle<IForwardGsfFitter> m_forwardGsfFitter{
+    this,
+    "ForwardGsfFitter",
+    "Trk::ForwardGsfFitter/ForwardGsfFitter",
+    ""
+  };
+  ToolHandle<IGsfSmoother> m_gsfSmoother{ this,
+                                          "GsfSmoother",
+                                          "Trk::GsfSmoother/GsfSmoother",
+                                          "" };
 
   bool m_reintegrateOutliers;
   bool m_makePerigee;
@@ -136,12 +157,14 @@ private:
   TrackFitInputPreparator* m_inputPreparator;
 
   // GSF Fit Statistics
-  mutable std::atomic<int> m_FitPRD;             // Number of Fit PrepRawData Calls
-  mutable std::atomic<int> m_FitMeasurementBase; // Number of Fit MeasurementBase Calls
-  mutable std::atomic<int> m_ForwardFailure;     // Number of Foward Fit Failures
-  mutable std::atomic<int> m_SmootherFailure;    // Number of Smoother Failures
-  mutable std::atomic<int> m_PerigeeFailure;     // Number of MakePerigee Failures
-  mutable std::atomic<int> m_fitQualityFailure;  // Number of Tracks that fail fit Quailty test
+  mutable std::atomic<int> m_FitPRD; // Number of Fit PrepRawData Calls
+  mutable std::atomic<int>
+    m_FitMeasurementBase; // Number of Fit MeasurementBase Calls
+  mutable std::atomic<int> m_ForwardFailure;  // Number of Foward Fit Failures
+  mutable std::atomic<int> m_SmootherFailure; // Number of Smoother Failures
+  mutable std::atomic<int> m_PerigeeFailure;  // Number of MakePerigee Failures
+  mutable std::atomic<int>
+    m_fitQualityFailure; // Number of Tracks that fail fit Quailty test
 };
 
 } // end Trk namespace
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfBetheHeitlerEffects.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfBetheHeitlerEffects.h
index 9511aeca28e3a75e27e44dcbc9e7e71512d00f4b..64c4415b778ca8eac17201419f2690153e647a39 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfBetheHeitlerEffects.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfBetheHeitlerEffects.h
@@ -29,7 +29,6 @@ class GsfBetheHeitlerEffects
 {
 
 private:
-  
   /** Helper class for construction and evaluation of polynomial */
   class Polynomial
   {
@@ -37,7 +36,8 @@ private:
     // Default constructor
     Polynomial() = default;
 
-    /** Constructor from a vector of coefficients (in decreasing order of powers of x */
+    /** Constructor from a vector of coefficients (in decreasing order of powers
+     * of x */
     Polynomial(const std::vector<double>& coefficients)
       : m_coefficients(coefficients){};
 
@@ -47,16 +47,17 @@ private:
       double sum(0.);
       std::vector<double>::const_iterator coefficient = m_coefficients.begin();
 
-      for (; coefficient != m_coefficients.end(); ++coefficient)
+      for (; coefficient != m_coefficients.end(); ++coefficient) {
         sum = t * sum + (*coefficient);
+      }
 
       return sum;
     }
+
   private:
     std::vector<double> m_coefficients;
   };
 
-
   struct ComponentValues
   {
     // Default ctors/dtor/assignment operators
@@ -77,9 +78,10 @@ private:
     double variance;
   };
 
-
 public:
-  GsfBetheHeitlerEffects(const std::string&, const std::string&, const IInterface*);
+  GsfBetheHeitlerEffects(const std::string&,
+                         const std::string&,
+                         const IInterface*);
 
   virtual ~GsfBetheHeitlerEffects() = default;
 
@@ -94,7 +96,8 @@ public:
                        const MaterialProperties&,
                        double,
                        PropDirection direction = anyDirection,
-                       ParticleHypothesis particleHypothesis = nonInteracting) const override final;
+                       ParticleHypothesis particleHypothesis =
+                         nonInteracting) const override final;
 
 private:
   typedef std::vector<ComponentValues> MixtureParameters;
@@ -121,13 +124,22 @@ private:
   double correctedFirstVariance(const double, const MixtureParameters&) const;
 
   // Logistic function - needed for transformation of weight and mean
-  inline double logisticFunction(const double x) const { return (double)1. / (1. + exp(-x)); }
+  inline double logisticFunction(const double x) const
+  {
+    return (double)1. / (1. + exp(-x));
+  }
 
   // First moment of the Bethe-Heitler distribution
-  inline double betheHeitlerMean(const double r) const { return (double)exp(-r); }
+  inline double betheHeitlerMean(const double r) const
+  {
+    return (double)exp(-r);
+  }
 
   // Second moment of the Bethe-Heitler distribution
-  inline double betheHeitlerVariance(const double r) const { return (double)exp(-r * log(3.) / log(2.)) - exp(-2 * r); }
+  inline double betheHeitlerVariance(const double r) const
+  {
+    return (double)exp(-r * log(3.) / log(2.)) - exp(-2 * r);
+  }
 
 private:
   std::string m_parameterisationFileName;
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfCombinedMaterialEffects.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfCombinedMaterialEffects.h
index 273ae852fa927a57c28e47e9d9c2978690a9ebe9..416ff54b121390a42ce6b1cdf4f220163e0421c9 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfCombinedMaterialEffects.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfCombinedMaterialEffects.h
@@ -8,8 +8,8 @@
 begin                : Friday 11th January 2005
 author               : atkinson
 email                : Tom.Atkinson@cern.ch
-decription           : Class definition for consideration of multiple scatter and
-                       energy loss effects from material simultaneously.
+decription           : Class definition for consideration of multiple scatter
+and energy loss effects from material simultaneously.
 *********************************************************************************/
 
 #ifndef TrkGsfCombinedMaterialEffects_H
@@ -17,9 +17,9 @@ decription           : Class definition for consideration of multiple scatter an
 
 #include "AthenaBaseComps/AthAlgTool.h"
 #include "GaudiKernel/ToolHandle.h"
-#include "TrkGaussianSumFilter/IMultiStateMaterialEffects.h"
-#include "TrkExInterfaces/IMultipleScatteringUpdator.h"
 #include "TrkExInterfaces/IEnergyLossUpdator.h"
+#include "TrkExInterfaces/IMultipleScatteringUpdator.h"
+#include "TrkGaussianSumFilter/IMultiStateMaterialEffects.h"
 
 namespace Trk {
 class GsfCombinedMaterialEffects
@@ -28,7 +28,9 @@ class GsfCombinedMaterialEffects
 {
 public:
   /** Constructor with AlgTool parameters*/
-  GsfCombinedMaterialEffects(const std::string&, const std::string&, const IInterface*);
+  GsfCombinedMaterialEffects(const std::string&,
+                             const std::string&,
+                             const IInterface*);
 
   /** Virtual destructor */
   virtual ~GsfCombinedMaterialEffects() override;
@@ -39,16 +41,15 @@ public:
   /** AlgTool finalise method */
   StatusCode finalize() override;
 
-  virtual void compute(IMultiStateMaterialEffects::Cache&,
-                       const ComponentParameters&,
-                       const MaterialProperties&,
-                       double,
-                       PropDirection = anyDirection,
-                       ParticleHypothesis = nonInteracting) const override final; 
+  virtual void compute(
+    IMultiStateMaterialEffects::Cache&,
+    const ComponentParameters&,
+    const MaterialProperties&,
+    double,
+    PropDirection = anyDirection,
+    ParticleHypothesis = nonInteracting) const override final;
 
 private:
-  
- 
   void scattering(IMultiStateMaterialEffects::Cache&,
                   const ComponentParameters&,
                   const MaterialProperties&,
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfExtrapolator.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfExtrapolator.h
index 60c8eb22e45955ae21ccfd58dd3f721fe84592f0..a2bddfdbd0e4efc1cb768de1a8172f7cdae911c2 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfExtrapolator.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfExtrapolator.h
@@ -49,7 +49,8 @@ class IMultiComponentStateMerger;
 class IMaterialMixtureConvolution;
 class IMultipleScatteringUpdator;
 /** @struct StateAtBoundarySurface
-  - Structure to contain information about a state at the interface between tracking volumes
+  - Structure to contain information about a state at the interface between
+  tracking volumes
   */
 
 struct StateAtBoundarySurface
@@ -100,39 +101,43 @@ public:
 
   /** Configured AlgTool extrapolation method (1) */
   virtual MultiComponentState extrapolate(
-    const EventContext&  ctx,
+    const EventContext& ctx,
     const MultiComponentState&,
     const Surface&,
     PropDirection direction = anyDirection,
     const BoundaryCheck& boundaryCheck = true,
-    ParticleHypothesis particleHypothesis = nonInteracting) const override final;
+    ParticleHypothesis particleHypothesis =
+      nonInteracting) const override final;
 
   /** Configured AlgTool extrapolation without material effects method (2) */
   virtual MultiComponentState extrapolateDirectly(
-    const EventContext&  ctx,
+    const EventContext& ctx,
     const MultiComponentState&,
     const Surface&,
     PropDirection direction = anyDirection,
     const BoundaryCheck& boundaryCheck = true,
-    ParticleHypothesis particleHypothesis = nonInteracting) const override final;
+    ParticleHypothesis particleHypothesis =
+      nonInteracting) const override final;
 
-  virtual std::unique_ptr<std::vector<const Trk::TrackStateOnSurface*>> extrapolateM(
-    const EventContext&  ctx,
-    const MultiComponentState&,
-    const Surface& sf,
-    PropDirection dir,
-    const BoundaryCheck& bcheck,
-    ParticleHypothesis particle) const override final;
+  virtual std::unique_ptr<std::vector<const Trk::TrackStateOnSurface*>>
+  extrapolateM(const EventContext& ctx,
+               const MultiComponentState&,
+               const Surface& sf,
+               PropDirection dir,
+               const BoundaryCheck& bcheck,
+               ParticleHypothesis particle) const override final;
 
 private:
   struct Cache
   {
-    bool m_recall;                                   //!< Flag the recall solution
-    const Surface* m_recallSurface;                  //!< Surface for recall
-    const Layer* m_recallLayer;                      //!< Layer for recall
-    const TrackingVolume* m_recallTrackingVolume;    //!< Tracking volume for recall
-    StateAtBoundarySurface m_stateAtBoundarySurface; //!< Instance of structure describing the state
-                                                     //!< at a boundary of tracking volumes
+    bool m_recall;                  //!< Flag the recall solution
+    const Surface* m_recallSurface; //!< Surface for recall
+    const Layer* m_recallLayer;     //!< Layer for recall
+    const TrackingVolume*
+      m_recallTrackingVolume; //!< Tracking volume for recall
+    StateAtBoundarySurface
+      m_stateAtBoundarySurface; //!< Instance of structure describing the state
+                                //!< at a boundary of tracking volumes
     std::unique_ptr<std::vector<const Trk::TrackStateOnSurface*>> m_matstates;
     std::vector<std::unique_ptr<const MultiComponentState>>
       m_mcsGarbageBin; //!< Garbage bin for MultiComponentState objects
@@ -151,7 +156,8 @@ private:
     {}
   };
 
-  /** These are the methods that do the actual heavy lifting when extrapolating with a cache */
+  /** These are the methods that do the actual heavy lifting when extrapolating
+   * with a cache */
   MultiComponentState extrapolateImpl(
     const EventContext& ctx,
     Cache& cache,
@@ -164,7 +170,7 @@ private:
 
   /** Configured AlgTool extrapolation without material effects method (2) */
   MultiComponentState extrapolateDirectlyImpl(
-    const EventContext&  ctx,
+    const EventContext& ctx,
     const IPropagator&,
     const MultiComponentState&,
     const Surface&,
@@ -172,12 +178,12 @@ private:
     const BoundaryCheck& boundaryCheck = true,
     ParticleHypothesis particleHypothesis = nonInteracting) const;
 
-
   /** Two primary private extrapolation methods
-    - extrapolateToVolumeBoundary - extrapolates to the exit of the destination tracking volume
+    - extrapolateToVolumeBoundary - extrapolates to the exit of the destination
+    tracking volume
     - Exit layer surface will be hit in this method.
-    - extrapolateInsideVolume     - extrapolates to the destination surface in the final tracking
-    volume
+    - extrapolateInsideVolume     - extrapolates to the destination surface in
+    the final tracking volume
     */
 
   void extrapolateToVolumeBoundary(
@@ -206,7 +212,7 @@ private:
 
   /** Layer stepping, stopping at the last layer before destination */
   MultiComponentState extrapolateFromLayerToLayer(
-    const EventContext&  ctx,
+    const EventContext& ctx,
     Cache& cache,
     const IPropagator&,
     const MultiComponentState&,
@@ -217,7 +223,7 @@ private:
     ParticleHypothesis particleHypothesis = nonInteracting) const;
 
   /** Single extrapolation step to an intermediate layer */
-   MultiComponentState extrapolateToIntermediateLayer(
+  MultiComponentState extrapolateToIntermediateLayer(
     const EventContext& ctx,
     Cache& cache,
     const IPropagator&,
@@ -241,8 +247,8 @@ private:
     const BoundaryCheck& boundaryCheck = true,
     ParticleHypothesis particleHypothesis = nonInteracting) const;
 
-  /** Extrapolation to consider material effects assuming all material on active sensor elements -
-   * CTB method */
+  /** Extrapolation to consider material effects assuming all material on active
+   * sensor elements - CTB method */
   Trk::MultiComponentState extrapolateSurfaceBasedMaterialEffects(
     const EventContext& ctx,
     const IPropagator&,
@@ -265,8 +271,8 @@ private:
   /** Method to choose propagator type */
   unsigned int propagatorType(const TrackingVolume& trackingVolume) const;
 
-  /** Method to initialise navigation parameters including starting state, layer and volume, and
-   * destination volume */
+  /** Method to initialise navigation parameters including starting state, layer
+   * and volume, and destination volume */
   void initialiseNavigation(const EventContext& ctx,
                             Cache& cache,
                             const IPropagator& propagator,
@@ -286,7 +292,6 @@ private:
                             PropDirection dir,
                             ParticleHypothesis particle) const;
 
-
   /** Method to set the recall information */
   void setRecallInformation(Cache& cache,
                             const Surface&,
@@ -305,20 +310,25 @@ private:
   /** Private method to empty garbage bins */
   void emptyGarbageBins(Cache& cache) const;
   /** Add material to vector*/
-  void addMaterialtoVector(Cache& cache,
-                           const Trk::Layer* nextLayer,
-                           const Trk::TrackParameters* nextPar,
-                           PropDirection direction = anyDirection,
-                           ParticleHypothesis particleHypothesis = nonInteracting) const;
+  void addMaterialtoVector(
+    Cache& cache,
+    const Trk::Layer* nextLayer,
+    const Trk::TrackParameters* nextPar,
+    PropDirection direction = anyDirection,
+    ParticleHypothesis particleHypothesis = nonInteracting) const;
 
   std::string layerRZoutput(const Trk::Layer* lay) const;
 
   std::string positionOutput(const Amg::Vector3D& pos) const;
 
-  int radialDirection(const Trk::MultiComponentState& pars, PropDirection dir) const;
+  int radialDirection(const Trk::MultiComponentState& pars,
+                      PropDirection dir) const;
 
   ToolHandleArray<IPropagator> m_propagators{ this, "Propagators", {}, "" };
-  ToolHandle<INavigator> m_navigator{ this, "Navigator", "Trk::Navigator/Navigator", "" };
+  ToolHandle<INavigator> m_navigator{ this,
+                                      "Navigator",
+                                      "Trk::Navigator/Navigator",
+                                      "" };
   ToolHandle<IMaterialMixtureConvolution> m_materialUpdator{
     this,
     "GsfMaterialConvolution",
@@ -331,36 +341,52 @@ private:
     "Trk::MultipleScatteringUpdator/AtlasMultipleScatteringUpdator",
     ""
   };
-  ToolHandle<IEnergyLossUpdator> m_elossupdators{ this,
-                                                  "EnergyLossUpdator",
-                                                  "Trk::EnergyLossUpdator/AtlasEnergyLossUpdator",
-                                                  "" };
+  ToolHandle<IEnergyLossUpdator> m_elossupdators{
+    this,
+    "EnergyLossUpdator",
+    "Trk::EnergyLossUpdator/AtlasEnergyLossUpdator",
+    ""
+  };
 
-  bool m_propagatorStickyConfiguration; //!< Switch between simple and full configured propagators
-  bool m_surfaceBasedMaterialEffects;   //!< Switch to turn on/off surface based material effects
+  bool m_propagatorStickyConfiguration; //!< Switch between simple and full
+                                        //!< configured propagators
+  bool m_surfaceBasedMaterialEffects;   //!< Switch to turn on/off surface based
+                                        //!< material effects
   bool m_fastField;
-  unsigned int m_propagatorConfigurationLevel; //!< Configuration level of the propagator
-  unsigned int m_propagatorSearchLevel;        //!< Search level of the propagator
+  unsigned int
+    m_propagatorConfigurationLevel; //!< Configuration level of the propagator
+  unsigned int m_propagatorSearchLevel; //!< Search level of the propagator
   Trk::MagneticFieldProperties m_fieldProperties;
 
-  mutable Gaudi::Accumulators::Counter<int, Gaudi::Accumulators::atomicity::full>
-    m_extrapolateCalls; //!< Statistics: Number of calls to the main extrapolate method
-  mutable Gaudi::Accumulators::Counter<int, Gaudi::Accumulators::atomicity::full>
-    m_extrapolateDirectlyCalls; //!< Statistics: Number of calls to the extrapolate directly method
-  mutable Gaudi::Accumulators::Counter<int, Gaudi::Accumulators::atomicity::full>
-    m_extrapolateDirectlyFallbacks; //!< Statistics: Number of calls to the extrapolate directly
-                                    //!< fallback
-  mutable Gaudi::Accumulators::Counter<int, Gaudi::Accumulators::atomicity::full>
-    m_navigationDistanceIncreaseBreaks; //!< Statistics: Number of times navigation stepping fails
-                                        //!< to go the right way
-  mutable Gaudi::Accumulators::Counter<int, Gaudi::Accumulators::atomicity::full>
-    m_oscillationBreaks; //!< Statistics: Number of times a tracking volume oscillation is detected
-  mutable Gaudi::Accumulators::Counter<int, Gaudi::Accumulators::atomicity::full>
-    m_missedVolumeBoundary; //!< Statistics: Number of times the volume boundary is missed
+  mutable Gaudi::Accumulators::Counter<int,
+                                       Gaudi::Accumulators::atomicity::full>
+    m_extrapolateCalls; //!< Statistics: Number of calls to the main extrapolate
+                        //!< method
+  mutable Gaudi::Accumulators::Counter<int,
+                                       Gaudi::Accumulators::atomicity::full>
+    m_extrapolateDirectlyCalls; //!< Statistics: Number of calls to the
+                                //!< extrapolate directly method
+  mutable Gaudi::Accumulators::Counter<int,
+                                       Gaudi::Accumulators::atomicity::full>
+    m_extrapolateDirectlyFallbacks; //!< Statistics: Number of calls to the
+                                    //!< extrapolate directly fallback
+  mutable Gaudi::Accumulators::Counter<int,
+                                       Gaudi::Accumulators::atomicity::full>
+    m_navigationDistanceIncreaseBreaks; //!< Statistics: Number of times
+                                        //!< navigation stepping fails to go the
+                                        //!< right way
+  mutable Gaudi::Accumulators::Counter<int,
+                                       Gaudi::Accumulators::atomicity::full>
+    m_oscillationBreaks; //!< Statistics: Number of times a tracking volume
+                         //!< oscillation is detected
+  mutable Gaudi::Accumulators::Counter<int,
+                                       Gaudi::Accumulators::atomicity::full>
+    m_missedVolumeBoundary; //!< Statistics: Number of times the volume boundary
+                            //!< is missed
 };
 
 } // end namespace Trk
 
-//for the inline implementations
+// for the inline implementations
 #include "GsfExtrapolator.icc"
 #endif
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfExtrapolator.icc b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfExtrapolator.icc
index 929f6913ce8412b15719a1494305e48e1effa06b..55109aa68bbfd7f155a5c08dc7fa94654edc8afd 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfExtrapolator.icc
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfExtrapolator.icc
@@ -3,10 +3,11 @@
  */
 
 inline void
-Trk::GsfExtrapolator::setRecallInformation(Cache& cache,
-                                           const Trk::Surface& recallSurface,
-                                           const Trk::Layer& recallLayer,
-                                           const Trk::TrackingVolume& recallTrackingVolume) const
+Trk::GsfExtrapolator::setRecallInformation(
+  Cache& cache,
+  const Trk::Surface& recallSurface,
+  const Trk::Layer& recallLayer,
+  const Trk::TrackingVolume& recallTrackingVolume) const
 {
   cache.m_recall = true;
   cache.m_recallSurface = &recallSurface;
@@ -24,8 +25,9 @@ Trk::GsfExtrapolator::resetRecallInformation(Cache& cache) const
 }
 
 inline void
-Trk::GsfExtrapolator::throwIntoGarbageBin(Cache& cache,
-                                          const Trk::MultiComponentState* garbage) const
+Trk::GsfExtrapolator::throwIntoGarbageBin(
+  Cache& cache,
+  const Trk::MultiComponentState* garbage) const
 {
   if (garbage) {
     std::unique_ptr<const Trk::MultiComponentState> sink(garbage);
@@ -34,7 +36,9 @@ Trk::GsfExtrapolator::throwIntoGarbageBin(Cache& cache,
 }
 
 inline void
-Trk::GsfExtrapolator::throwIntoGarbageBin(Cache& cache, const Trk::TrackParameters* garbage) const
+Trk::GsfExtrapolator::throwIntoGarbageBin(
+  Cache& cache,
+  const Trk::TrackParameters* garbage) const
 {
   if (garbage) {
     std::unique_ptr<const Trk::TrackParameters> sink(garbage);
@@ -52,6 +56,3 @@ Trk::GsfExtrapolator::emptyGarbageBins(Cache& cache) const
   cache.m_tpGarbageBin.clear();
   cache.m_matstates.reset(nullptr);
 }
-
-
-
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfMaterialEffectsUpdator.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfMaterialEffectsUpdator.h
index 481277df4bd7b7a5478341d63eabdab1fad9b7ae..f13c4bcf2f0b9021d129c8a124ae3b7d0cc82716 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfMaterialEffectsUpdator.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfMaterialEffectsUpdator.h
@@ -30,7 +30,9 @@ class GsfMaterialEffectsUpdator
 
 public:
   /** Constructor with AlgTool parameters */
-  GsfMaterialEffectsUpdator(const std::string&, const std::string&, const IInterface*);
+  GsfMaterialEffectsUpdator(const std::string&,
+                            const std::string&,
+                            const IInterface*);
 
   /** Virtual destructor */
   virtual ~GsfMaterialEffectsUpdator();
@@ -41,15 +43,16 @@ public:
   /** AlgTool finalisation*/
   StatusCode finalize();
 
-  /** Method for updating the state with material effects provided by the layer object */
+  /** Method for updating the state with material effects provided by the layer
+   * object */
   virtual Trk::MultiComponentState updateState(
     const ComponentParameters&,
     const Layer&,
     PropDirection direction = anyDirection,
     ParticleHypothesis particleHypothesis = nonInteracting) const;
 
-  /** Method for updating the state with material effects provided by a material properties object
-   * and a pathlength */
+  /** Method for updating the state with material effects provided by a material
+   * properties object and a pathlength */
   virtual Trk::MultiComponentState updateState(
     const ComponentParameters&,
     const MaterialProperties&,
@@ -57,7 +60,8 @@ public:
     PropDirection direction = anyDirection,
     ParticleHypothesis particleHypothesis = nonInteracting) const;
 
-  /** Method for the state with material effects provided by the layer object prior to propagation
+  /** Method for the state with material effects provided by the layer object
+   * prior to propagation
    */
   virtual Trk::MultiComponentState preUpdateState(
     const ComponentParameters&,
@@ -65,7 +69,8 @@ public:
     PropDirection direction = anyDirection,
     ParticleHypothesis particleHypothesis = nonInteracting) const;
 
-  /** Method for the state with material effects provided by the layer object after propagation */
+  /** Method for the state with material effects provided by the layer object
+   * after propagation */
   virtual Trk::MultiComponentState postUpdateState(
     const ComponentParameters&,
     const Layer&,
@@ -74,18 +79,23 @@ public:
 
 private:
   /** Method to perform centralised calculation of updated state */
-  Trk::MultiComponentState compute(const ComponentParameters&,
-                                   const MaterialProperties&,
-                                   double,
-                                   PropDirection direction = anyDirection,
-                                   ParticleHypothesis particleHypothesis = nonInteracting) const;
+  Trk::MultiComponentState compute(
+    const ComponentParameters&,
+    const MaterialProperties&,
+    double,
+    PropDirection direction = anyDirection,
+    ParticleHypothesis particleHypothesis = nonInteracting) const;
 
   /** Method to calculate the updated momentum based on material effects */
   bool updateP(AmgVector(5) &, double) const;
 
 private:
-  ToolHandle<IMultiStateMaterialEffects>
-    m_materialEffects{ this, "MaterialEffects", "Trk::GsfCombinedMaterialEffects/GsfCombinedMaterialEffects", "" };
+  ToolHandle<IMultiStateMaterialEffects> m_materialEffects{
+    this,
+    "MaterialEffects",
+    "Trk::GsfCombinedMaterialEffects/GsfCombinedMaterialEffects",
+    ""
+  };
   bool m_useReferenceMaterial;
   double m_momentumCut;
 };
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfMaterialMixtureConvolution.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfMaterialMixtureConvolution.h
index 96576d8dee199f16619e740c8405a71ef242e4f0..bdc93e3f8a761a736121f920bc1f66ae528da5c8 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfMaterialMixtureConvolution.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfMaterialMixtureConvolution.h
@@ -32,7 +32,9 @@ class GsfMaterialMixtureConvolution
 
 public:
   //!< Constructor with AlgTool parameters
-  GsfMaterialMixtureConvolution(const std::string&, const std::string&, const IInterface*);
+  GsfMaterialMixtureConvolution(const std::string&,
+                                const std::string&,
+                                const IInterface*);
 
   //!< Destructor
   virtual ~GsfMaterialMixtureConvolution();
@@ -44,43 +46,47 @@ public:
   virtual StatusCode finalize() override;
 
   //!< Convolution with full material properties
-  virtual MultiComponentState update(
-    const MultiComponentState&,
-    const Layer&,
-    PropDirection direction = anyDirection,
-    ParticleHypothesis particleHypothesis = nonInteracting) const override final;
+  virtual MultiComponentState update(const MultiComponentState&,
+                                     const Layer&,
+                                     PropDirection direction = anyDirection,
+                                     ParticleHypothesis particleHypothesis =
+                                       nonInteracting) const override final;
 
   //!< Convolution with pre-measurement-update material properties
   virtual MultiComponentState preUpdate(const MultiComponentState&,
                                         const Layer&,
                                         PropDirection direction = anyDirection,
-                                        ParticleHypothesis particleHypothesis = nonInteracting) const override final;
+                                        ParticleHypothesis particleHypothesis =
+                                          nonInteracting) const override final;
 
   //!< Convolution with post-measurement-update material properties
   virtual MultiComponentState postUpdate(const MultiComponentState&,
                                          const Layer&,
                                          PropDirection direction = anyDirection,
-                                         ParticleHypothesis particleHypothesis = nonInteracting) const override final;
+                                         ParticleHypothesis particleHypothesis =
+                                           nonInteracting) const override final;
 
   //!< Retain for now redundant simplified material effects
   virtual MultiComponentState simplifiedMaterialUpdate(
     const MultiComponentState& multiComponentState,
     PropDirection direction = anyDirection,
-    ParticleHypothesis particleHypothesis = nonInteracting) const override final;
+    ParticleHypothesis particleHypothesis =
+      nonInteracting) const override final;
 
 private:
-
-  Gaudi::Property<unsigned int> m_maximumNumberOfComponents{ this,
-                                                             "MaximumNumberOfComponents",
-                                                             12,
-                                                             "Maximum number of components" };
- 
- 
-  ToolHandle<IMultiStateMaterialEffectsUpdator> m_updator{ this,
-                                                           "MaterialEffectsUpdator",
-                                                           "Trk::GsfMaterialEffectsUpdator/GsfMaterialEffectsUpdator",
-                                                           "" };
-  
+  Gaudi::Property<unsigned int> m_maximumNumberOfComponents{
+    this,
+    "MaximumNumberOfComponents",
+    12,
+    "Maximum number of components"
+  };
+
+  ToolHandle<IMultiStateMaterialEffectsUpdator> m_updator{
+    this,
+    "MaterialEffectsUpdator",
+    "Trk::GsfMaterialEffectsUpdator/GsfMaterialEffectsUpdator",
+    ""
+  };
 };
 
 } // end Trk namespace
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfMeasurementUpdator.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfMeasurementUpdator.h
index 15ab30c8ac1a1228faebd65b69e567df3fae11a5..7325b7d56940c55ac48e5dd4471a59b7649f5e02 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfMeasurementUpdator.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfMeasurementUpdator.h
@@ -8,8 +8,8 @@
 begin                : Friday 25th February 2005
 author               : atkinson
 email                : Tom.Atkinson@cern.ch
-decription           : Class for performing updates on multi-component states for
-                       the gaussian-sum filter. Now an AlgTool
+decription           : Class for performing updates on multi-component states
+for the gaussian-sum filter. Now an AlgTool
 *********************************************************************************/
 
 #ifndef TrkGsfMeasurementUpdator_H
@@ -36,16 +36,19 @@ class GsfMeasurementUpdator
 {
 
 private:
-  /** Private typedef for calling the correct updator member function depending of direction of
-   * fitting */
-  typedef Trk::TrackParameters* (Trk::IUpdator::*Updator)(const Trk::TrackParameters&,
-                                                          const LocalParameters&,
-                                                          const Amg::MatrixX&,
-                                                          FitQualityOnSurface*&)const;
+  /** Private typedef for calling the correct updator member function depending
+   * of direction of fitting */
+  typedef Trk::TrackParameters* (Trk::IUpdator::*Updator)(
+    const Trk::TrackParameters&,
+    const LocalParameters&,
+    const Amg::MatrixX&,
+    FitQualityOnSurface*&)const;
 
 public:
   /** Constructor with parameters to be passed to AlgTool */
-  GsfMeasurementUpdator(const std::string&, const std::string&, const IInterface*);
+  GsfMeasurementUpdator(const std::string&,
+                        const std::string&,
+                        const IInterface*);
 
   /** Virtual destructor */
   virtual ~GsfMeasurementUpdator() = default;
@@ -57,39 +60,49 @@ public:
   StatusCode finalize() override;
 
   /** Method for updating the multi-state with a new measurement */
-  virtual MultiComponentState update(MultiComponentState&&,
-                                     const MeasurementBase&) const override final;
+  virtual MultiComponentState update(
+    MultiComponentState&&,
+    const MeasurementBase&) const override final;
 
-  /** Method for updating the multi-state with a new measurement and calculate the fit qaulity at
-   * the same time*/
+  /** Method for updating the multi-state with a new measurement and calculate
+   * the fit qaulity at the same time*/
   virtual MultiComponentState update(
     Trk::MultiComponentState&&,
     const Trk::MeasurementBase&,
     std::unique_ptr<FitQualityOnSurface>& fitQoS) const override final;
 
-  /** Method for GSF smoother to calculate unbiased parameters of the multi-component state */
-  virtual MultiComponentState getUnbiasedTrackParameters(MultiComponentState&&,
-                                                         const MeasurementBase&) const override final;
+  /** Method for GSF smoother to calculate unbiased parameters of the
+   * multi-component state */
+  virtual MultiComponentState getUnbiasedTrackParameters(
+    MultiComponentState&&,
+    const MeasurementBase&) const override final;
 
-  /** Method for determining the chi2 of the multi-component state and the number of degrees of
-   * freedom */
-  virtual const FitQualityOnSurface* fitQuality(const MultiComponentState&, const MeasurementBase&) const override;
+  /** Method for determining the chi2 of the multi-component state and the
+   * number of degrees of freedom */
+  virtual const FitQualityOnSurface* fitQuality(
+    const MultiComponentState&,
+    const MeasurementBase&) const override;
 
 private:
   MultiComponentState calculateFilterStep(MultiComponentState&&,
                                           const MeasurementBase&,
                                           const Updator) const;
 
-  MultiComponentState calculateFilterStep(MultiComponentState&&,
-                                          const MeasurementBase&,
-                                          std::unique_ptr<FitQualityOnSurface>& fitQoS) const;
+  MultiComponentState calculateFilterStep(
+    MultiComponentState&&,
+    const MeasurementBase&,
+    std::unique_ptr<FitQualityOnSurface>& fitQoS) const;
 
   bool invalidComponent(const Trk::TrackParameters* trackParameters) const;
 
-  MultiComponentState rebuildState(Trk::MultiComponentState&& stateBeforeUpdate) const;
+  MultiComponentState rebuildState(
+    Trk::MultiComponentState&& stateBeforeUpdate) const;
 
 private:
-  ToolHandle<IUpdator> m_updator{ this, "Updator", "Trk::KalmanUpdator/KalmanUpdator", "" };
+  ToolHandle<IUpdator> m_updator{ this,
+                                  "Updator",
+                                  "Trk::KalmanUpdator/KalmanUpdator",
+                                  "" };
 };
 }
 
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfSmoother.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfSmoother.h
index 39a17bbdb42c5920f6d7a00e98df2297a4163a20..4158cebf49cf019784c62629cd7e9ba02c881405 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfSmoother.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/GsfSmoother.h
@@ -9,18 +9,19 @@ begin                : Wednesday 9th March 2005
 author               : atkinson
 email                : Tom.Atkinson@cern.ch
 decription           : Class definition for the GSF smoother
-********************************************************************************** */
+**********************************************************************************
+*/
 
 #ifndef TrkGsfSmoother_H
 #define TrkGsfSmoother_H
 
 #include "TrkGaussianSumFilter/IGsfSmoother.h"
 
+#include "AthenaBaseComps/AthAlgTool.h"
+#include "GaudiKernel/ToolHandle.h"
 #include "TrkEventPrimitives/ParticleHypothesis.h"
 #include "TrkFitterUtils/FitterTypes.h"
 #include "TrkMultiComponentStateOnSurface/MultiComponentState.h"
-#include "AthenaBaseComps/AthAlgTool.h"
-#include "GaudiKernel/ToolHandle.h"
 
 namespace Trk {
 
@@ -49,30 +50,36 @@ public:
   /** Configure the GSF smoother
       - Configure the extrapolator
       - Configure the measurement updator */
-  virtual StatusCode configureTools(const ToolHandle<IMultiStateExtrapolator>&,
-                                    const ToolHandle<IMultiStateMeasurementUpdator>&);
+  virtual StatusCode configureTools(
+    const ToolHandle<IMultiStateExtrapolator>&,
+    const ToolHandle<IMultiStateMeasurementUpdator>&);
 
   /** Gsf smoother method */
-  virtual SmoothedTrajectory* fit(const ForwardTrajectory&,
-                                  const ParticleHypothesis particleHypothesis = nonInteracting,
-                                  const CaloCluster_OnTrack* ccot = nullptr) const;
+  virtual SmoothedTrajectory* fit(
+    const ForwardTrajectory&,
+    const ParticleHypothesis particleHypothesis = nonInteracting,
+    const CaloCluster_OnTrack* ccot = nullptr) const;
 
 private:
   /** Method for combining the forwards fitted state and the smoothed state */
-  MultiComponentState  combine(const MultiComponentState&, const MultiComponentState&) const;
+  MultiComponentState combine(const MultiComponentState&,
+                              const MultiComponentState&) const;
 
   /** Methof to add the CaloCluster onto the track */
-  MultiComponentState  addCCOT(const Trk::TrackStateOnSurface* currentState,
-                               const Trk::CaloCluster_OnTrack* ccot,
-                               Trk::SmoothedTrajectory* smoothedTrajectory) const;
+  MultiComponentState addCCOT(
+    const Trk::TrackStateOnSurface* currentState,
+    const Trk::CaloCluster_OnTrack* ccot,
+    Trk::SmoothedTrajectory* smoothedTrajectory) const;
 
 private:
   bool m_combineWithFitter;
 
-  Gaudi::Property<unsigned int> m_maximumNumberOfComponents{ this,
-                                                             "MaximumNumberOfComponents",
-                                                             12,
-                                                             "Maximum number of components" };
+  Gaudi::Property<unsigned int> m_maximumNumberOfComponents{
+    this,
+    "MaximumNumberOfComponents",
+    12,
+    "Maximum number of components"
+  };
   /*
    * Special Tool Handles set by the configureTools
    */
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IForwardGsfFitter.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IForwardGsfFitter.h
index 8354dcf618a6fb5bb3344db4ea641766b6d5718e..0193e7adb93726d41bbb82967453b7922e354c38 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IForwardGsfFitter.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IForwardGsfFitter.h
@@ -9,7 +9,8 @@ created              : Thursday 8th January 2009
 authors              : amorley,christos
 email                : Anthony.Morley@cern.ch
 decription           : Abstract interface for the forward GSF fitter
-********************************************************************************** */
+**********************************************************************************
+*/
 
 #ifndef TrkIForwardGsfFitter_H
 #define TrkIForwardGsfFitter_H
@@ -36,7 +37,10 @@ class IForwardGsfFitter : virtual public IAlgTool
 
 public:
   /** AlgTool interface method */
-  static const InterfaceID& interfaceID() { return InterfaceID_ForwardGsfFitter; };
+  static const InterfaceID& interfaceID()
+  {
+    return InterfaceID_ForwardGsfFitter;
+  };
 
   /** Virtual destructor */
   virtual ~IForwardGsfFitter() = default;
@@ -45,9 +49,10 @@ public:
       - Configure the extrapolator
       - Configure the measurement updator
       - Configure the RIO_OnTrack creator */
-  virtual StatusCode configureTools(const ToolHandle<Trk::IMultiStateExtrapolator>&,
-                                    const ToolHandle<Trk::IMultiStateMeasurementUpdator>&,
-                                    const ToolHandle<Trk::IRIO_OnTrackCreator>&) = 0;
+  virtual StatusCode configureTools(
+    const ToolHandle<Trk::IMultiStateExtrapolator>&,
+    const ToolHandle<Trk::IMultiStateMeasurementUpdator>&,
+    const ToolHandle<Trk::IRIO_OnTrackCreator>&) = 0;
 
   /** Forward GSF fit using PrepRawData */
   virtual std::unique_ptr<ForwardTrajectory> fitPRD(
@@ -61,8 +66,8 @@ public:
     const TrackParameters&,
     const ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
 
-  /** The interface will later be extended so that the initial state can be additionally a
-   * MultiComponentState object!
+  /** The interface will later be extended so that the initial state can be
+   * additionally a MultiComponentState object!
    */
 };
 
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IGsfSmoother.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IGsfSmoother.h
index b60d348354d33f24c2322946189dd30ff2c71d04..aa20ac008a75bc3b63d0f3d329e1af05d55dd403 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IGsfSmoother.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IGsfSmoother.h
@@ -9,7 +9,8 @@ created              : Thursday 8th January 2009
 author               : amorley
 email                : Anthony.Morley@cern.ch
 decription           : Abstract interface for the GSF smoother
-********************************************************************************** */
+**********************************************************************************
+*/
 
 #ifndef TrkIGsfSmoother_H
 #define TrkIGsfSmoother_H
@@ -42,13 +43,15 @@ public:
   /** Configure the GSF smoother
       - Configure the extrapolator
       - Configure the measurement updator */
-  virtual StatusCode configureTools(const ToolHandle<IMultiStateExtrapolator>&,
-                                    const ToolHandle<IMultiStateMeasurementUpdator>&) = 0;
+  virtual StatusCode configureTools(
+    const ToolHandle<IMultiStateExtrapolator>&,
+    const ToolHandle<IMultiStateMeasurementUpdator>&) = 0;
 
   /** Gsf smoother method */
-  virtual SmoothedTrajectory* fit(const ForwardTrajectory&,
-                                  const ParticleHypothesis particleHypothesis = nonInteracting,
-                                  const CaloCluster_OnTrack* ccot = nullptr) const = 0;
+  virtual SmoothedTrajectory* fit(
+    const ForwardTrajectory&,
+    const ParticleHypothesis particleHypothesis = nonInteracting,
+    const CaloCluster_OnTrack* ccot = nullptr) const = 0;
 };
 
 } // end Trk namespace
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMaterialMixtureConvolution.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMaterialMixtureConvolution.h
index d92d16f7da2283f6fa8e8d57966368e6b053d9aa..19906cd287913ddfbc4c0556a8b70e7ae3ca27e7 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMaterialMixtureConvolution.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMaterialMixtureConvolution.h
@@ -21,35 +21,42 @@ decription           : Abstract base class for convolution of material effects
 
 namespace Trk {
 class Layer;
-static const InterfaceID IID_IMaterialMixtureConvolution("IMaterialMixtureConvolution", 1, 0);
+static const InterfaceID
+  IID_IMaterialMixtureConvolution("IMaterialMixtureConvolution", 1, 0);
 
 class IMaterialMixtureConvolution : virtual public IAlgTool
 {
 
 public:
   //!< IAlgTool and AlgTool interface method
-  static const InterfaceID& interfaceID() { return IID_IMaterialMixtureConvolution; };
+  static const InterfaceID& interfaceID()
+  {
+    return IID_IMaterialMixtureConvolution;
+  };
 
   //!< Virtual destructor
   virtual ~IMaterialMixtureConvolution() = default;
 
   //!< Convolution with full material properties
-  virtual MultiComponentState update(const MultiComponentState&,
-                                     const Layer&,
-                                     PropDirection direction = anyDirection,
-                                     ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
+  virtual MultiComponentState update(
+    const MultiComponentState&,
+    const Layer&,
+    PropDirection direction = anyDirection,
+    ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
 
   //!< Convolution with pre-measurement-update material properties
-  virtual MultiComponentState preUpdate(const MultiComponentState&,
-                                        const Layer&,
-                                        PropDirection direction = anyDirection,
-                                        ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
+  virtual MultiComponentState preUpdate(
+    const MultiComponentState&,
+    const Layer&,
+    PropDirection direction = anyDirection,
+    ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
 
   //!< Convolution with post-measurement-update material properties
-  virtual MultiComponentState postUpdate(const MultiComponentState&,
-                                         const Layer&,
-                                         PropDirection direction = anyDirection,
-                                         ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
+  virtual MultiComponentState postUpdate(
+    const MultiComponentState&,
+    const Layer&,
+    PropDirection direction = anyDirection,
+    ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
 
   //!< Retain for now redundant simplified material effects
   virtual MultiComponentState simplifiedMaterialUpdate(
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateExtrapolator.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateExtrapolator.h
index e9e1694b5180bc746c646a2deec26e20d6f6a3d2..84406c0487bd6bc4308c8658a3ebdcf2d726591e 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateExtrapolator.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateExtrapolator.h
@@ -9,7 +9,8 @@ begin                : Tuesday 25th January 2005
 author               : atkinson,Morley,Anastopoulos
 decription           : Extrapolation of a MultiComponentState to a destination
                        surface
-================================================================================= */
+=================================================================================
+*/
 
 #ifndef TrkIMultiStateExtrapolator_H
 #define TrkIMultiStateExtrapolator_H
@@ -22,8 +23,8 @@ decription           : Extrapolation of a MultiComponentState to a destination
 #include "TrkParameters/TrackParameters.h"
 #include "TrkSurfaces/BoundaryCheck.h"
 
-#include "GaudiKernel/IAlgTool.h"
 #include "GaudiKernel/EventContext.h"
+#include "GaudiKernel/IAlgTool.h"
 
 #include <memory>
 #include <vector>
@@ -36,7 +37,9 @@ class Track;
 class TrackingVolume;
 class TrackStateOnSurface;
 
-static const InterfaceID IID_IMultiStateExtrapolator("IMultiStateExtrapolator", 1, 0);
+static const InterfaceID IID_IMultiStateExtrapolator("IMultiStateExtrapolator",
+                                                     1,
+                                                     0);
 
 class IMultiStateExtrapolator : virtual public IAlgTool
 {
@@ -45,11 +48,14 @@ public:
   virtual ~IMultiStateExtrapolator() = default;
 
   /** AlgTool interface method */
-  static const InterfaceID& interfaceID() { return IID_IMultiStateExtrapolator; };
+  static const InterfaceID& interfaceID()
+  {
+    return IID_IMultiStateExtrapolator;
+  };
 
   /** Configured AlgTool extrapolation method (1) */
   virtual MultiComponentState extrapolate(
-    const EventContext&  ctx,
+    const EventContext& ctx,
     const MultiComponentState&,
     const Surface&,
     PropDirection direction = anyDirection,
@@ -58,20 +64,20 @@ public:
 
   /** Configured AlgTool extrapolation without material effects method (2) */
   virtual MultiComponentState extrapolateDirectly(
-    const EventContext&  ctx,
+    const EventContext& ctx,
     const MultiComponentState&,
     const Surface&,
     PropDirection direction = anyDirection,
     const BoundaryCheck& boundaryCheck = true,
     ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
 
-  virtual std::unique_ptr<std::vector<const Trk::TrackStateOnSurface*>> extrapolateM(
-    const EventContext&  ctx,
-    const MultiComponentState&,
-    const Surface&,
-    PropDirection dir = anyDirection,
-    const BoundaryCheck& bcheck = true,
-    ParticleHypothesis particle = nonInteracting) const = 0;
+  virtual std::unique_ptr<std::vector<const Trk::TrackStateOnSurface*>>
+  extrapolateM(const EventContext& ctx,
+               const MultiComponentState&,
+               const Surface&,
+               PropDirection dir = anyDirection,
+               const BoundaryCheck& bcheck = true,
+               ParticleHypothesis particle = nonInteracting) const = 0;
 };
 
 } // end trk namespace
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateMaterialEffects.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateMaterialEffects.h
index 1858ed4be01d39098128a169520f40fd01864036..3ed6d6c547c1417a694190404be5bc25f6a1c064 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateMaterialEffects.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateMaterialEffects.h
@@ -11,7 +11,8 @@ email                : Tom.Atkinson@cern.ch
 decription           : (Non-pure) abstract base class for defining material
                        effects including energy loss and multiple scattering for
                        use in the multi-component state environment. These
-                       material effects will produce multi-component state outputs
+                       material effects will produce multi-component state
+outputs
 ************************************************************************************/
 
 #ifndef Trk_IMultiStateMaterialEffects_H
@@ -26,14 +27,15 @@ decription           : (Non-pure) abstract base class for defining material
 
 #include "TrkExInterfaces/IMaterialEffectsUpdator.h"
 
-#include<Eigen/StdVector>
+#include <Eigen/StdVector>
 #include <memory>
 
 namespace Trk {
 
 class MaterialProperties;
 
-static const InterfaceID IID_IMultiStateMaterialEffects("IMultiStateMaterialEffects", 1, 0);
+static const InterfaceID
+  IID_IMultiStateMaterialEffects("IMultiStateMaterialEffects", 1, 0);
 
 class IMultiStateMaterialEffects : virtual public IAlgTool
 {
@@ -56,12 +58,13 @@ public:
     std::vector<double> weights;
     std::vector<double> deltaPs;
     /*
-     * Suggested 
+     * Suggested
      * by Eigen 3.3.7 manual
-     * "you must use the Eigen::aligned_allocator (not another aligned allocator), 
-     * and #include <Eigen/StdVector>."
+     * "you must use the Eigen::aligned_allocator (not another aligned
+     * allocator), and #include <Eigen/StdVector>."
      */
-    std::vector<AmgSymMatrix(5),Eigen::aligned_allocator<AmgSymMatrix(5)> > deltaCovariances;
+    std::vector<AmgSymMatrix(5), Eigen::aligned_allocator<AmgSymMatrix(5)>>
+      deltaCovariances;
     void reset()
     {
       weights.clear();
@@ -71,17 +74,21 @@ public:
   };
 
   /** Alg tool and IAlgTool interface method */
-  static const InterfaceID& interfaceID() { return IID_IMultiStateMaterialEffects; };
+  static const InterfaceID& interfaceID()
+  {
+    return IID_IMultiStateMaterialEffects;
+  };
 
   /** virtual destructor */
   virtual ~IMultiStateMaterialEffects() = default;
 
-  virtual void compute(IMultiStateMaterialEffects::Cache&,
-                       const ComponentParameters&,
-                       const MaterialProperties&,
-                       double,
-                       PropDirection direction = anyDirection,
-                       ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
+  virtual void compute(
+    IMultiStateMaterialEffects::Cache&,
+    const ComponentParameters&,
+    const MaterialProperties&,
+    double,
+    PropDirection direction = anyDirection,
+    ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
 };
 }
 #endif
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateMaterialEffectsUpdator.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateMaterialEffectsUpdator.h
index 376ceb9a5c011a0d0caffda836c5140b6712c277..89db28e7a8130743a0741bfc68ee5f3d8624657b 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateMaterialEffectsUpdator.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateMaterialEffectsUpdator.h
@@ -27,44 +27,57 @@ namespace Trk {
 class MaterialProperties;
 class Layer;
 
-static const InterfaceID IID_IMultiStateMaterialEffectsUpdator("IMultiStateMaterialEffectsUpdator", 1, 0);
+static const InterfaceID IID_IMultiStateMaterialEffectsUpdator(
+  "IMultiStateMaterialEffectsUpdator",
+  1,
+  0);
 
 class IMultiStateMaterialEffectsUpdator : virtual public IAlgTool
 {
 
 public:
   /** AlgTool interface method */
-  static const InterfaceID& interfaceID() { return IID_IMultiStateMaterialEffectsUpdator; };
+  static const InterfaceID& interfaceID()
+  {
+    return IID_IMultiStateMaterialEffectsUpdator;
+  };
 
   /** Virtual destructor */
   virtual ~IMultiStateMaterialEffectsUpdator() = default;
 
-  /** Method for updating the state with material effects provided by the layer object */
-  virtual Trk::MultiComponentState updateState(const ComponentParameters&,
-                                               const Layer&,
-                                               PropDirection direction = alongMomentum,
-                                               ParticleHypothesis = nonInteracting) const = 0;
-
-  /** Method for updating the state with material effects provided by a material properties object
-   * and a pathlength */
-  virtual Trk::MultiComponentState updateState(const ComponentParameters&,
-                                               const MaterialProperties&,
-                                               double,
-                                               PropDirection = alongMomentum,
-                                               ParticleHypothesis = nonInteracting) const = 0;
-
-  /** Method for the state with material effects provided by the layer object prior to propagation
+  /** Method for updating the state with material effects provided by the layer
+   * object */
+  virtual Trk::MultiComponentState updateState(
+    const ComponentParameters&,
+    const Layer&,
+    PropDirection direction = alongMomentum,
+    ParticleHypothesis = nonInteracting) const = 0;
+
+  /** Method for updating the state with material effects provided by a material
+   * properties object and a pathlength */
+  virtual Trk::MultiComponentState updateState(
+    const ComponentParameters&,
+    const MaterialProperties&,
+    double,
+    PropDirection = alongMomentum,
+    ParticleHypothesis = nonInteracting) const = 0;
+
+  /** Method for the state with material effects provided by the layer object
+   * prior to propagation
    */
-  virtual Trk::MultiComponentState preUpdateState(const ComponentParameters&,
-                                                  const Layer&,
-                                                  PropDirection direction = anyDirection,
-                                                  ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
-
-  /**  Method for the state with material effects provided by the layer object after propagation */
-  virtual Trk::MultiComponentState postUpdateState(const ComponentParameters&,
-                                                   const Layer&,
-                                                   PropDirection direction = anyDirection,
-                                                   ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
+  virtual Trk::MultiComponentState preUpdateState(
+    const ComponentParameters&,
+    const Layer&,
+    PropDirection direction = anyDirection,
+    ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
+
+  /**  Method for the state with material effects provided by the layer object
+   * after propagation */
+  virtual Trk::MultiComponentState postUpdateState(
+    const ComponentParameters&,
+    const Layer&,
+    PropDirection direction = anyDirection,
+    ParticleHypothesis particleHypothesis = nonInteracting) const = 0;
 };
 
 } // end Trk namespace
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateMeasurementUpdator.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateMeasurementUpdator.h
index 246129e4a238bc8d092ff53d71fff8c5f8820236..2965b0d6d0856bbfe71d7b4f772ada623306d347 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateMeasurementUpdator.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/IMultiStateMeasurementUpdator.h
@@ -24,33 +24,44 @@ namespace Trk {
 
 class MeasurementBase;
 
-static const InterfaceID IID_IMultiStateMeasurementUpdator("IMultiStateMeasurementUpdator", 1, 0);
+static const InterfaceID
+  IID_IMultiStateMeasurementUpdator("IMultiStateMeasurementUpdator", 1, 0);
 
 class IMultiStateMeasurementUpdator : virtual public IAlgTool
 {
 
 public:
   /** IAlgTool and AlgTool interface method */
-  static const InterfaceID& interfaceID() { return IID_IMultiStateMeasurementUpdator; };
+  static const InterfaceID& interfaceID()
+  {
+    return IID_IMultiStateMeasurementUpdator;
+  };
 
   /** Virtual destructor */
   virtual ~IMultiStateMeasurementUpdator() = default;
 
   /** Method for forward filters to incorporate measurement updates */
-  virtual MultiComponentState update(MultiComponentState&&, const MeasurementBase&) const = 0;
+  virtual MultiComponentState update(MultiComponentState&&,
+                                     const MeasurementBase&) const = 0;
 
-  /** Method for updating the multi-state with a new measurement and calculate the fit qaulity at
-   * the same time*/
-  virtual MultiComponentState update(Trk::MultiComponentState&&,
-                                     const Trk::MeasurementBase&,
-                                     std::unique_ptr<FitQualityOnSurface>& fitQoS) const = 0;
+  /** Method for updating the multi-state with a new measurement and calculate
+   * the fit qaulity at the same time*/
+  virtual MultiComponentState update(
+    Trk::MultiComponentState&&,
+    const Trk::MeasurementBase&,
+    std::unique_ptr<FitQualityOnSurface>& fitQoS) const = 0;
 
-  /** Method for reverse filters (smoothers) to determine the unbiased track parameters */
-  virtual MultiComponentState getUnbiasedTrackParameters(MultiComponentState&&,
-                                                         const MeasurementBase&) const = 0;
+  /** Method for reverse filters (smoothers) to determine the unbiased track
+   * parameters */
+  virtual MultiComponentState getUnbiasedTrackParameters(
+    MultiComponentState&&,
+    const MeasurementBase&) const = 0;
 
-  /** Method for determining the chi2 of the track and the number of degrees of freedom */
-  virtual const FitQualityOnSurface* fitQuality(const MultiComponentState&, const MeasurementBase&) const = 0;
+  /** Method for determining the chi2 of the track and the number of degrees of
+   * freedom */
+  virtual const FitQualityOnSurface* fitQuality(
+    const MultiComponentState&,
+    const MeasurementBase&) const = 0;
 };
 
 } // end Trk namespace
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/KLGaussianMixtureReduction.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/KLGaussianMixtureReduction.h
index a17d7a6786ef5cbe433d011213054c897a7c628e..2525c5632efd681aafa7d8e97d75786be35c91fb 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/KLGaussianMixtureReduction.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/KLGaussianMixtureReduction.h
@@ -3,53 +3,54 @@
 */
 
 /**
-* @file  KLGaussianMixtureReduction.h
-* @author amorley
-* @author Anastopoulos
-* @date 26th November 2019
-* @brief Function that help implement component merging .
-*/
+ * @file  KLGaussianMixtureReduction.h
+ * @author amorley
+ * @author Anastopoulos
+ * @date 26th November 2019
+ * @brief Function that help implement component merging .
+ */
 #ifndef KLGaussianMixReductionUtils_H
 #define KLGaussianMixReductionUtils_H
 
-#include "CxxUtils/restrict.h"
 #include "CxxUtils/features.h"
-#include <vector>
-#include <utility>
+#include "CxxUtils/restrict.h"
 #include <cstdint>
+#include <utility>
+#include <vector>
 
 namespace GSFUtils {
 
 /**
  * Alignment used  for SIMD
  */
-constexpr size_t alignment =32;
+constexpr size_t alignment = 32;
 
 /**
  * The main pupropse of the utilities here
- * are to facilitate the calculation of the 
- * divergence between components of the mixture 
+ * are to facilitate the calculation of the
+ * divergence between components of the mixture
  * and the merging of similar componets.
  *
- * For a revies of available methods look 
+ * For a revies of available methods look
  * https://arxiv.org/pdf/2001.00727.pdf
  *
- * Here we opt for formula 10. 
- * For an 1D Normal distributions this becomes: 
+ * Here we opt for formula 10.
+ * For an 1D Normal distributions this becomes:
  *
- * (variance1-variance2) (1/variance1 - 1/variance2) - 
+ * (variance1-variance2) (1/variance1 - 1/variance2) -
  * (mean1-mean2)(1/variance+1/variance)(mean1-mean2)
  *
  * We use doubles for the intermediate calculations
  * but we store the final distances to short in an array
  * of floats.
  *
-*/
-struct Component1D{
-  double mean=0.;
-  double cov=0.;
-  double invCov=1e10; 
-  double weight=0.;
+ */
+struct Component1D
+{
+  double mean = 0.;
+  double cov = 0.;
+  double invCov = 1e10;
+  double weight = 0.;
 };
 
 /**
@@ -63,45 +64,46 @@ struct Component1D{
  *   [.............................
  *   [(N-1,0),(N-1,1),(N-1,2),(N-1,3).......(N-1,N-2)]
  *
- *   With size 
+ *   With size
  *   1+2+3+ .... (N-1) = N*(N-1)/2
  *
  *   The lexicographical storage allocation function is
- *   Loc(i,j) = i*(i-1)/2 + j 
+ *   Loc(i,j) = i*(i-1)/2 + j
  *   e.g
- *   (1,0) --> 1 *(1-1)/2 + 0 --> 0 
+ *   (1,0) --> 1 *(1-1)/2 + 0 --> 0
  *   (2,0) --> 2 *(2-1)/2 + 0 --> 1
  *   (2,1) --> 2 *(2-1)/2 + 1 --> 2
  *   (3,0) --> 3 * (3-1)/2 +0 --> 3
- *   Leading to  
+ *   Leading to
  *   [(1,0),(2,0),(2,1),(3,0),(3,1),(3,2)...... (N-1,N-2)]
- * 
+ *
  *
  *   The N-1 Rows  map to value K of the 1st element in the pair.
- *   K=1,2,3,...N-1  and each one has size K. 
+ *   K=1,2,3,...N-1  and each one has size K.
  *   Each Row starts at array positions K*(K-1)/2
- *   e.g 
+ *   e.g
  *   The row for element 1 starts at array position 0.
  *   The row for element 2 starts at array position 1.
  *   The row for element N-1  starts at array positon (N-1)*(N-2)/2
- *   
- *   The N-1 Columns map to the value K of the second  element in the pair 
+ *
+ *   The N-1 Columns map to the value K of the second  element in the pair
  *   0,1,2 ... N-2
  *   The array position follow (i-1)*i/2+K;
  *   where i : K+1 .... N-1 [for(i=K+1;i<N;++i)
- *   e.g 
- *   0 appears as 2nd element in the pair at array positions 
+ *   e.g
+ *   0 appears as 2nd element in the pair at array positions
  *   [0,1,3,6...]
  *   1 appears as 2nd element in the pair at array positions
- *   [2,4,7...] 
+ *   [2,4,7...]
  *   2 appears as 2nd element in the pair at array positions
- *   [5,8,12....] 
+ *   [5,8,12....]
  *   N-2 appears as 2nd element once at position [N(N-1)/2-1]
  *
  */
-struct triangularToIJ{
-  int32_t I=-1;
-  int32_t J=-1;
+struct triangularToIJ
+{
+  int32_t I = -1;
+  int32_t J = -1;
 };
 
 /**
@@ -111,12 +113,12 @@ typedef float* ATH_RESTRICT floatPtrRestrict;
 typedef Component1D* ATH_RESTRICT componentPtrRestrict;
 
 /**
- * Merge the componentsIn and return 
+ * Merge the componentsIn and return
  * which componets got merged
  */
 std::vector<std::pair<int32_t, int32_t>>
-findMerges(componentPtrRestrict componentsIn, 
-           const int32_t inputSize, 
+findMerges(componentPtrRestrict componentsIn,
+           const int32_t inputSize,
            const int32_t reducedSize);
 
 /**
@@ -125,24 +127,18 @@ findMerges(componentPtrRestrict componentsIn,
  */
 #if HAVE_FUNCTION_MULTIVERSIONING
 #if defined(__x86_64__)
-__attribute__((target("avx2")))
-std::pair<int32_t,float> 
+__attribute__((target("avx2"))) std::pair<int32_t, float>
 findMinimumIndex(const floatPtrRestrict distancesIn, const int32_t n);
-__attribute__((target("sse4.1"))) 
-std::pair<int32_t,float> 
+__attribute__((target("sse4.1"))) std::pair<int32_t, float>
 findMinimumIndex(const floatPtrRestrict distancesIn, const int32_t n);
-__attribute__((target("sse2"))) 
-std::pair<int32_t,float> 
+__attribute__((target("sse2"))) std::pair<int32_t, float>
 findMinimumIndex(const floatPtrRestrict distancesIn, const int32_t n);
-#endif //x86_64 specific targets
+#endif // x86_64 specific targets
 __attribute__((target("default")))
-#endif// function multiversioning
-std::pair<int32_t,float> 
+#endif // function multiversioning
+std::pair<int32_t, float>
 findMinimumIndex(const floatPtrRestrict distancesIn, const int32_t n);
 
 } // namespace KLGaussianMixtureReduction
 
-      
-
-
 #endif
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/MultiComponentStateAssembler.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/MultiComponentStateAssembler.h
index 902c027c6e5d27ed9a6329a8cc9ad4fa61a5e2d0..f92bf819fef786132c12c502918a8b3c9880bb88 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/MultiComponentStateAssembler.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/MultiComponentStateAssembler.h
@@ -52,13 +52,13 @@ struct Cache
 void
 reset(Cache& cache);
 
-/** Method to add a single set of Trk::ComponentParameters to the cached Trk::MultiComponentState
- * object under construction */
+/** Method to add a single set of Trk::ComponentParameters to the cached
+ * Trk::MultiComponentState object under construction */
 bool
 addComponent(Cache& cache, ComponentParameters&&);
 
-/** Method to add a new Trk::MultiComponentState to the cached Trk::MultiComponentState o
- * bject under construction */
+/** Method to add a new Trk::MultiComponentState to the cached
+ * Trk::MultiComponentState o bject under construction */
 bool
 addMultiState(Cache& cache, Trk::MultiComponentState&&);
 
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/MultiComponentStateCombiner.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/MultiComponentStateCombiner.h
index ad65f1117fb85c1ecfb1e4cbb7aa1edc339673a7..c6bc1accc8198fb4003a09e2c1d28a7a1ffe85ef 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/MultiComponentStateCombiner.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/MultiComponentStateCombiner.h
@@ -23,18 +23,25 @@ namespace MultiComponentStateCombiner {
 
 /** Calculate combined state of many components */
 std::unique_ptr<Trk::TrackParameters>
-combine(const MultiComponentState&, const bool useMode = false, const double fractionPDFused = 1.0);
+combine(const MultiComponentState&,
+        const bool useMode = false,
+        const double fractionPDFused = 1.0);
 
 /** Combined/merge a component to another one */
 void
-combineWithWeight(Trk::ComponentParameters& mergeTo, const Trk::ComponentParameters& addThis);
+combineWithWeight(Trk::ComponentParameters& mergeTo,
+                  const Trk::ComponentParameters& addThis);
 
 /** Calculate combined state and weight of many components */
 std::unique_ptr<Trk::ComponentParameters>
-combineWithWeight(const MultiComponentState&, const bool useMode = false, const double fractionPDFused = 1.0);
+combineWithWeight(const MultiComponentState&,
+                  const bool useMode = false,
+                  const double fractionPDFused = 1.0);
 
 std::unique_ptr<Trk::ComponentParameters>
-compute(const MultiComponentState*, const bool useMode = false, const double fractionPDFused = 1.0);
+compute(const MultiComponentState*,
+        const bool useMode = false,
+        const double fractionPDFused = 1.0);
 }
 } // end Trk namespace
 
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/MultiComponentStateModeCalculator.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/MultiComponentStateModeCalculator.h
index 7a21a20efeff8d0fb2bfcff31af360c08397840b..d1892ae88c1f55719f1bb1bf38a4284fe3baa529 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/MultiComponentStateModeCalculator.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/MultiComponentStateModeCalculator.h
@@ -8,7 +8,8 @@
 begin                : Thursday 6th July 2006
 author               : atkinson
 email                : Tom.Atkinson@cern.ch
-description          : Class to calculate the mode (q/p) of a gaussian mixtureArray
+description          : Class to calculate the mode (q/p) of a gaussian
+mixtureArray
 ***********************************************************************************/
 
 #ifndef Trk_MultiComponentStateModeCalculator_H
@@ -45,11 +46,14 @@ struct Component
 std::array<double, 10>
 calculateMode(const MultiComponentState&);
 
-//!<  method to extract the weight, mean and sigma values from the multi-component state
+//!<  method to extract the weight, mean and sigma values from the
+//!<  multi-component state
 void
-fillMixture(const MultiComponentState&, std::array<std::vector<Component>, 5>& mixture);
+fillMixture(const MultiComponentState&,
+            std::array<std::vector<Component>, 5>& mixture);
 
-//!<  method to find the mode using the Newton-Raphson method based on a starting guess
+//!<  method to find the mode using the Newton-Raphson method based on a
+//!<  starting guess
 double
 findMode(double, int, const std::array<std::vector<Component>, 5>& mixture);
 
@@ -61,16 +65,20 @@ pdf(double, int, const std::array<std::vector<Component>, 5>& mixture);
 double
 d1pdf(double, int, const std::array<std::vector<Component>, 5>& mixture);
 
-//!<  method to determine the second order derivative of the pdf at a given value
+//!<  method to determine the second order derivative of the pdf at a given
+//!<  value
 double
 d2pdf(double, int, const std::array<std::vector<Component>, 5>& mixture);
 
-//!<  method to determine the value of the a gaussian distribution at a given value
+//!<  method to determine the value of the a gaussian distribution at a given
+//!<  value
 double
 gaus(double x, double mean, double sigma);
 
 double
-findModeGlobal(double, int, const std::array<std::vector<Component>, 5>& mixture);
+findModeGlobal(double,
+               int,
+               const std::array<std::vector<Component>, 5>& mixture);
 
 double
 width(int i, const std::array<std::vector<Component>, 5>& mixture);
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/PosteriorWeightsCalculator.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/PosteriorWeightsCalculator.h
index 6de5445a03a8f24cee9cfbece1759cf2170a61cf..78c1d5edea01038b7a32003aaa9ce849ff02adfc 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/PosteriorWeightsCalculator.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/PosteriorWeightsCalculator.h
@@ -28,61 +28,72 @@ namespace Trk {
 class PosteriorWeightsCalculator
 {
 public:
-  std::vector<Trk::ComponentParameters> weights(MultiComponentState&&, const MeasurementBase&) const;
+  std::vector<Trk::ComponentParameters> weights(MultiComponentState&&,
+                                                const MeasurementBase&) const;
 
 private:
-  /** Function to calculate the determinant and  chi2 of a measurement for a 1D hit */
-  std::pair<double, double> calculateWeight_1D(const TrackParameters* componentTrackParameters,
-                                               const AmgSymMatrix(5) * predictedCov,
-                                               const double measPar,
-                                               const double measCov,
-                                               int paramKey) const;
-
-  /** Function to calculate the determinant and  chi2 of a measurement for a 2D hit
-      specially when the measurements are when local x and local y  */
-  std::pair<double, double> calculateWeight_2D_3(const TrackParameters* componentTrackParameters,
-                                                 const AmgSymMatrix(5) * predictedCov,
-                                                 const AmgVector(2) & measPar,
-                                                 const AmgSymMatrix(2) & measCov) const;
-
-  /** Tempplated Function to calculate the determinant and  chi2 of a measurement for a N'D hit */
+  /** Function to calculate the determinant and  chi2 of a measurement for a 1D
+   * hit */
+  std::pair<double, double> calculateWeight_1D(
+    const TrackParameters* componentTrackParameters,
+    const AmgSymMatrix(5) * predictedCov,
+    const double measPar,
+    const double measCov,
+    int paramKey) const;
+
+  /** Function to calculate the determinant and  chi2 of a measurement for a 2D
+     hit specially when the measurements are when local x and local y  */
+  std::pair<double, double> calculateWeight_2D_3(
+    const TrackParameters* componentTrackParameters,
+    const AmgSymMatrix(5) * predictedCov,
+    const AmgVector(2) & measPar,
+    const AmgSymMatrix(2) & measCov) const;
+
+  /** Tempplated Function to calculate the determinant and  chi2 of a
+   * measurement for a N'D hit */
   template<int DIM>
-  std::pair<double, double> calculateWeight_T(const TrackParameters* componentTrackParameters,
-                                              const AmgSymMatrix(5) * predictedCov,
-                                              const AmgVector(DIM) & measPar,
-                                              const AmgSymMatrix(DIM) & measCov,
-                                              int paramKey) const;
+  std::pair<double, double> calculateWeight_T(
+    const TrackParameters* componentTrackParameters,
+    const AmgSymMatrix(5) * predictedCov,
+    const AmgVector(DIM) & measPar,
+    const AmgSymMatrix(DIM) & measCov,
+    int paramKey) const;
 };
 
 template<int DIM>
 std::pair<double, double>
-PosteriorWeightsCalculator::calculateWeight_T(const TrackParameters* componentTrackParameters,
-                                              const AmgSymMatrix(5) * predictedCov,
-                                              const AmgVector(DIM) & measPar,
-                                              const AmgSymMatrix(DIM) & measCov,
-                                              int paramKey) const
+PosteriorWeightsCalculator::calculateWeight_T(
+  const TrackParameters* componentTrackParameters,
+  const AmgSymMatrix(5) * predictedCov,
+  const AmgVector(DIM) & measPar,
+  const AmgSymMatrix(DIM) & measCov,
+  int paramKey) const
 {
 
-  static const ProjectionMatricesSet reMatrices(5); //!< expansion and reduction matrices set
+  static const ProjectionMatricesSet reMatrices(
+    5); //!< expansion and reduction matrices set
   // Define the expansion matrix
-  const AmgMatrix(DIM, 5) H = reMatrices.expansionMatrix(paramKey).block<DIM, 5>(0, 0);
+  const AmgMatrix(DIM, 5) H =
+    reMatrices.expansionMatrix(paramKey).block<DIM, 5>(0, 0);
 
   // Calculate the residual
   AmgVector(DIM) r = measPar - H * componentTrackParameters->parameters();
 
-  // Residual covariance. Posterior weights is calculated used predicted state and measurement.
-  // Therefore add covariances
+  // Residual covariance. Posterior weights is calculated used predicted state
+  // and measurement. Therefore add covariances
   AmgSymMatrix(DIM) R(measCov + H * (*predictedCov) * H.transpose());
 
   // compute determinant of residual
   const double det = R.determinant();
 
   if (det == 0) {
-    // ATH_MSG_WARNING( "Determinant is 0, cannot invert matrix... Ignoring component" );
+    // ATH_MSG_WARNING( "Determinant is 0, cannot invert matrix... Ignoring
+    // component" );
     return std::pair<double, double>(0, 0);
   }
   // Compute Chi2
-  return std::pair<double, double>(det, (1. / (double)DIM) * ((r.transpose() * R.inverse() * r)(0, 0)));
+  return std::pair<double, double>(
+    det, (1. / (double)DIM) * ((r.transpose() * R.inverse() * r)(0, 0)));
 }
 
 } // end Trk namespace
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/QuickCloseComponentsMultiStateMerger.h b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/QuickCloseComponentsMultiStateMerger.h
index 2515056819b2e4fbf5edb2b72d83f7176c52cf76..69e3582be5f0de983609e6aadd6056b0e1e4737a 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/QuickCloseComponentsMultiStateMerger.h
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/TrkGaussianSumFilter/QuickCloseComponentsMultiStateMerger.h
@@ -22,9 +22,8 @@ decription           : Class for merging components of a multi-state based on
 namespace Trk {
 class IMultiComponentStateCombiner;
 class TrackStateOnSurface;
-namespace QuickCloseComponentsMultiStateMerger
-{
-  /** Method for merging components - ownership of objects is passed */
+namespace QuickCloseComponentsMultiStateMerger {
+/** Method for merging components - ownership of objects is passed */
 MultiComponentState
 merge(Trk::MultiComponentState&&, const unsigned int maximumNumberOfComponents);
 
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/ForwardGsfFitter.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/ForwardGsfFitter.cxx
index 13251988c1fe02a91ee87c6508a000c4a497372f..8d3b574cca28536d15d0874d04d520eb92a3f264 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/ForwardGsfFitter.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/ForwardGsfFitter.cxx
@@ -9,7 +9,8 @@ begin                : Wednesday 9th March 2005
 author               : amorley, atkinson
 email                : Anthony.Morley@cern.ch, Tom.Atkinson@cern.ch
 decription           : Implementation code for ForwardGsfFitter class
-********************************************************************************** */
+**********************************************************************************
+*/
 
 #include "TrkGaussianSumFilter/ForwardGsfFitter.h"
 
@@ -27,7 +28,9 @@ decription           : Implementation code for ForwardGsfFitter class
 #include "TrkSurfaces/Surface.h"
 #include "TrkToolInterfaces/IRIO_OnTrackCreator.h"
 
-Trk::ForwardGsfFitter::ForwardGsfFitter(const std::string& type, const std::string& name, const IInterface* parent)
+Trk::ForwardGsfFitter::ForwardGsfFitter(const std::string& type,
+                                        const std::string& name,
+                                        const IInterface* parent)
   : AthAlgTool(type, name, parent)
   , m_cutChiSquaredPerNumberDOF(50.)
   , m_overideMaterialEffects(4)
@@ -37,7 +40,8 @@ Trk::ForwardGsfFitter::ForwardGsfFitter(const std::string& type, const std::stri
 
   declareInterface<IForwardGsfFitter>(this);
   declareProperty("StateChi2PerNDOFCut", m_cutChiSquaredPerNumberDOF);
-  declareProperty("OverideForwardsMaterialEffects", m_overideMaterialEffectsSwitch);
+  declareProperty("OverideForwardsMaterialEffects",
+                  m_overideMaterialEffectsSwitch);
   declareProperty("MaterialEffectsInForwardFitter", m_overideMaterialEffects);
 }
 
@@ -45,12 +49,15 @@ StatusCode
 Trk::ForwardGsfFitter::initialize()
 {
 
-  ATH_MSG_DEBUG("A cut on Chi2 / NDOF: " << m_cutChiSquaredPerNumberDOF << " will be applied");
+  ATH_MSG_DEBUG("A cut on Chi2 / NDOF: " << m_cutChiSquaredPerNumberDOF
+                                         << " will be applied");
 
   Trk::ParticleSwitcher particleSwitcher;
-  m_overideParticleHypothesis = particleSwitcher.particle[m_overideMaterialEffects];
+  m_overideParticleHypothesis =
+    particleSwitcher.particle[m_overideMaterialEffects];
   if (m_overideMaterialEffectsSwitch) {
-    ATH_MSG_INFO("Material effects in forwards fitter have been overiden by jobOptions... New "
+    ATH_MSG_INFO("Material effects in forwards fitter have been overiden by "
+                 "jobOptions... New "
                  "Trk::ParticleHypothesis: "
                  << m_overideMaterialEffects);
   }
@@ -68,9 +75,10 @@ Trk::ForwardGsfFitter::finalize()
 }
 
 StatusCode
-Trk::ForwardGsfFitter::configureTools(const ToolHandle<IMultiStateExtrapolator>& extrapolator,
-                                      const ToolHandle<IMultiStateMeasurementUpdator>& measurementUpdator,
-                                      const ToolHandle<IRIO_OnTrackCreator>& rioOnTrackCreator)
+Trk::ForwardGsfFitter::configureTools(
+  const ToolHandle<IMultiStateExtrapolator>& extrapolator,
+  const ToolHandle<IMultiStateMeasurementUpdator>& measurementUpdator,
+  const ToolHandle<IRIO_OnTrackCreator>& rioOnTrackCreator)
 {
   m_extrapolator = extrapolator;
   m_updator = measurementUpdator;
@@ -85,9 +93,10 @@ Trk::ForwardGsfFitter::configureTools(const ToolHandle<IMultiStateExtrapolator>&
    =============================================================================================================*/
 
 std::unique_ptr<Trk::ForwardTrajectory>
-Trk::ForwardGsfFitter::fitPRD(const Trk::PrepRawDataSet& inputPrepRawDataSet,
-                              const Trk::TrackParameters& estimatedTrackParametersNearOrigin,
-                              const Trk::ParticleHypothesis particleHypothesis) const
+Trk::ForwardGsfFitter::fitPRD(
+  const Trk::PrepRawDataSet& inputPrepRawDataSet,
+  const Trk::TrackParameters& estimatedTrackParametersNearOrigin,
+  const Trk::ParticleHypothesis particleHypothesis) const
 {
 
   // Check that the updator is instansiated
@@ -102,7 +111,8 @@ Trk::ForwardGsfFitter::fitPRD(const Trk::PrepRawDataSet& inputPrepRawDataSet,
   }
 
   if (!m_rioOnTrackCreator) {
-    ATH_MSG_ERROR("The RIO_OnTrackCreator is not configured for use with the PrepRawData set... Exiting!");
+    ATH_MSG_ERROR("The RIO_OnTrackCreator is not configured for use with the "
+                  "PrepRawData set... Exiting!");
     return nullptr;
   }
 
@@ -120,8 +130,8 @@ Trk::ForwardGsfFitter::fitPRD(const Trk::PrepRawDataSet& inputPrepRawDataSet,
     configuredParticleHypothesis = particleHypothesis;
   }
 
-  // Extract PrepRawDataSet into new local object and check that the PrepRawData is associated with
-  // a detector element
+  // Extract PrepRawDataSet into new local object and check that the PrepRawData
+  // is associated with a detector element
   Trk::PrepRawDataSet prepRawDataSet;
   Trk::PrepRawDataSet::const_iterator prepRawData = inputPrepRawDataSet.begin();
 
@@ -137,29 +147,38 @@ Trk::ForwardGsfFitter::fitPRD(const Trk::PrepRawDataSet& inputPrepRawDataSet,
   // Create new trajectory
   auto forwardTrajectory = std::make_unique<Trk::ForwardTrajectory>();
 
-  // Prepare the multi-component state. For starting guess this has single component, weight 1
+  // Prepare the multi-component state. For starting guess this has single
+  // component, weight 1
   const AmgVector(5)& par = estimatedTrackParametersNearOrigin.parameters();
 
   Trk::ComponentParameters componentParametersNearOrigin(
-    estimatedTrackParametersNearOrigin.associatedSurface().createTrackParameters(
-      par[Trk::loc1], par[Trk::loc2], par[Trk::phi], par[Trk::theta], par[Trk::qOverP], nullptr /*no errors*/),
+    estimatedTrackParametersNearOrigin.associatedSurface()
+      .createTrackParameters(par[Trk::loc1],
+                             par[Trk::loc2],
+                             par[Trk::phi],
+                             par[Trk::theta],
+                             par[Trk::qOverP],
+                             nullptr /*no errors*/),
     1.);
 
   Trk::MultiComponentState multiComponentStateNearOrigin{};
-  multiComponentStateNearOrigin.push_back(std::move(componentParametersNearOrigin));
+  multiComponentStateNearOrigin.push_back(
+    std::move(componentParametersNearOrigin));
 
   // Loop over all PrepRawData measurements
   prepRawData = prepRawDataSet.begin();
 
   for (; prepRawData != prepRawDataSet.end(); ++prepRawData) {
 
-    // Every valid step the ForwardTrajectory object passed to the stepForwardFit method is updated
-    bool stepIsValid = stepForwardFit(forwardTrajectory.get(),
-                                      *prepRawData,
-                                      nullptr,
-                                      (*prepRawData)->detectorElement()->surface((*prepRawData)->identify()),
-                                      multiComponentStateNearOrigin,
-                                      configuredParticleHypothesis);
+    // Every valid step the ForwardTrajectory object passed to the
+    // stepForwardFit method is updated
+    bool stepIsValid = stepForwardFit(
+      forwardTrajectory.get(),
+      *prepRawData,
+      nullptr,
+      (*prepRawData)->detectorElement()->surface((*prepRawData)->identify()),
+      multiComponentStateNearOrigin,
+      configuredParticleHypothesis);
 
     if (!stepIsValid) {
       ATH_MSG_DEBUG("Fitter step is not valid... Exiting!");
@@ -175,9 +194,10 @@ Trk::ForwardGsfFitter::fitPRD(const Trk::PrepRawDataSet& inputPrepRawDataSet,
  */
 
 std::unique_ptr<Trk::ForwardTrajectory>
-Trk::ForwardGsfFitter::fitMeasurements(const Trk::MeasurementSet& inputMeasurementSet,
-                                       const Trk::TrackParameters& estimatedTrackParametersNearOrigin,
-                                       const Trk::ParticleHypothesis particleHypothesis) const
+Trk::ForwardGsfFitter::fitMeasurements(
+  const Trk::MeasurementSet& inputMeasurementSet,
+  const Trk::TrackParameters& estimatedTrackParametersNearOrigin,
+  const Trk::ParticleHypothesis particleHypothesis) const
 {
   // Check that the updator is instansiated
   if (!m_updator) {
@@ -207,18 +227,25 @@ Trk::ForwardGsfFitter::fitMeasurements(const Trk::MeasurementSet& inputMeasureme
   // This memory should be freed by the fitter / smoother master method
   auto forwardTrajectory = std::make_unique<Trk::ForwardTrajectory>();
 
-  // Prepare the multi-component state. For starting guess this has single component, weight 1
+  // Prepare the multi-component state. For starting guess this has single
+  // component, weight 1
   const AmgVector(5)& par = estimatedTrackParametersNearOrigin.parameters();
 
   AmgSymMatrix(5)* covariance = nullptr;
 
   Trk::ComponentParameters componentParametersNearOrigin(
-    estimatedTrackParametersNearOrigin.associatedSurface().createTrackParameters(
-      par[Trk::loc1], par[Trk::loc2], par[Trk::phi], par[Trk::theta], par[Trk::qOverP], covariance /*no errors*/),
+    estimatedTrackParametersNearOrigin.associatedSurface()
+      .createTrackParameters(par[Trk::loc1],
+                             par[Trk::loc2],
+                             par[Trk::phi],
+                             par[Trk::theta],
+                             par[Trk::qOverP],
+                             covariance /*no errors*/),
     1.);
 
   Trk::MultiComponentState multiComponentStateNearOrigin{};
-  multiComponentStateNearOrigin.push_back(std::move(componentParametersNearOrigin));
+  multiComponentStateNearOrigin.push_back(
+    std::move(componentParametersNearOrigin));
 
   // Loop over all MeasurementBase objects in set
   Trk::MeasurementSet::const_iterator measurement = inputMeasurementSet.begin();
@@ -245,16 +272,18 @@ Trk::ForwardGsfFitter::fitMeasurements(const Trk::MeasurementSet& inputMeasureme
  */
 
 bool
-Trk::ForwardGsfFitter::stepForwardFit(ForwardTrajectory* forwardTrajectory,
-                                      const Trk::PrepRawData* originalPrepRawData,
-                                      const Trk::MeasurementBase* originalMeasurement,
-                                      const Trk::Surface& surface,
-                                      Trk::MultiComponentState& updatedState,
-                                      const Trk::ParticleHypothesis particleHypothesis) const
+Trk::ForwardGsfFitter::stepForwardFit(
+  ForwardTrajectory* forwardTrajectory,
+  const Trk::PrepRawData* originalPrepRawData,
+  const Trk::MeasurementBase* originalMeasurement,
+  const Trk::Surface& surface,
+  Trk::MultiComponentState& updatedState,
+  const Trk::ParticleHypothesis particleHypothesis) const
 {
   // Protect against undefined Measurement or PrepRawData
   if (!originalPrepRawData && !originalMeasurement) {
-    ATH_MSG_WARNING("No measurement information passed to StepForwardFit... Exiting!");
+    ATH_MSG_WARNING(
+      "No measurement information passed to StepForwardFit... Exiting!");
     return false;
   }
 
@@ -291,48 +320,60 @@ Trk::ForwardGsfFitter::stepForwardFit(ForwardTrajectory* forwardTrajectory,
       ATH_MSG_WARNING("State combination failed... exiting");
       return false;
     }
-    // Create a new MeasurementBase object from PrepRawData using new calibration
-    measurement.reset(m_rioOnTrackCreator->correct(*originalPrepRawData, *combinedState));
+    // Create a new MeasurementBase object from PrepRawData using new
+    // calibration
+    measurement.reset(
+      m_rioOnTrackCreator->correct(*originalPrepRawData, *combinedState));
     combinedState.reset();
   }
   // ==========================
   // Perform measurement update
   // ==========================
   if (!measurement) {
-    ATH_MSG_WARNING("Cannot use MeasurementBase for measurement update, it is not defined... Exiting!");
+    ATH_MSG_WARNING("Cannot use MeasurementBase for measurement update, it is "
+                    "not defined... Exiting!");
     return false;
   }
   std::unique_ptr<Trk::FitQualityOnSurface> fitQuality;
-  updatedState =
-    m_updator->update(std::move(*(MultiComponentStateHelpers::clone(extrapolatedState))), *measurement, fitQuality);
+  updatedState = m_updator->update(
+    std::move(*(MultiComponentStateHelpers::clone(extrapolatedState))),
+    *measurement,
+    fitQuality);
   if (updatedState.empty()) {
     ATH_MSG_DEBUG("Measurement update of the state failed... Exiting!");
     return false;
   }
- // Bail if the fit quality is not defined:
+  // Bail if the fit quality is not defined:
   if (!fitQuality) {
-    ATH_MSG_DEBUG("Failed to make fit quality... rejecting forwards trajectory");
+    ATH_MSG_DEBUG(
+      "Failed to make fit quality... rejecting forwards trajectory");
     return false;
   }
   // Reject hits with excessive Chi2
-  else if (fitQuality->chiSquared() > m_cutChiSquaredPerNumberDOF * fitQuality->numberDoF()) {
-    ATH_MSG_DEBUG("Update with new measurement caused track to fail Chi Squared test, removing the object");
+  if (fitQuality->chiSquared() >
+      m_cutChiSquaredPerNumberDOF * fitQuality->numberDoF()) {
+    ATH_MSG_DEBUG("Update with new measurement caused track to fail Chi "
+                  "Squared test, removing the object");
     fitQuality = std::make_unique<FitQuality>(1, 1);
     std::bitset<TrackStateOnSurface::NumberOfTrackStateOnSurfaceTypes> type(0);
     type.set(TrackStateOnSurface::Outlier);
     const Trk::MultiComponentStateOnSurface* multiComponentStateOnSurface =
-      new MultiComponentStateOnSurface(measurement.release(),
-                                       MultiComponentStateHelpers::clone(extrapolatedState).release(),
-                                       fitQuality.release(),
-                                       nullptr,
-                                       type);
+      new MultiComponentStateOnSurface(
+        measurement.release(),
+        MultiComponentStateHelpers::clone(extrapolatedState).release(),
+        fitQuality.release(),
+        nullptr,
+        type);
 
     forwardTrajectory->push_back(multiComponentStateOnSurface);
     // Clean up objects associated with removed measurement
     updatedState = std::move(extrapolatedState);
   } else {
-    const Trk::MultiComponentStateOnSurface* multiComponentStateOnSurface = new MultiComponentStateOnSurface(
-      measurement.release(), MultiComponentStateHelpers::clone(extrapolatedState).release(), fitQuality.release());
+    const Trk::MultiComponentStateOnSurface* multiComponentStateOnSurface =
+      new MultiComponentStateOnSurface(
+        measurement.release(),
+        MultiComponentStateHelpers::clone(extrapolatedState).release(),
+        fitQuality.release());
     forwardTrajectory->push_back(multiComponentStateOnSurface);
   }
   return true;
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GaussianSumFitter.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GaussianSumFitter.cxx
index 50a86685833429525b867461aea5aee7dac92432..65be4c549ec523ee3bc5ffd9175aeea32656bb9f 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GaussianSumFitter.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GaussianSumFitter.cxx
@@ -9,7 +9,8 @@ begin                : Monday 7th March 2005
 author               : amorley atkinson
 email                : Anthony.Morley@cern.ch Tom.Atkinson@cern.ch
 decription           : Implementation code for Gaussian Sum Fitter class
-********************************************************************************** */
+**********************************************************************************
+*/
 
 #include "TrkGaussianSumFilter/GaussianSumFitter.h"
 #include "TrkGaussianSumFilter/IForwardGsfFitter.h"
@@ -40,7 +41,9 @@ decription           : Implementation code for Gaussian Sum Fitter class
 #include <algorithm>
 #include <vector>
 
-Trk::GaussianSumFitter::GaussianSumFitter(const std::string& type, const std::string& name, const IInterface* parent)
+Trk::GaussianSumFitter::GaussianSumFitter(const std::string& type,
+                                          const std::string& name,
+                                          const IInterface* parent)
   : AthAlgTool(type, name, parent)
   , m_reintegrateOutliers(false)
   , m_makePerigee(true)
@@ -80,43 +83,52 @@ Trk::GaussianSumFitter::initialize()
   // Request the Chrono Service
   ATH_CHECK(m_chronoSvc.retrieve());
 
-  // Request the GSF forward fitter - hardwired type and instanace name for the GSF
+  // Request the GSF forward fitter - hardwired type and instanace name for the
+  // GSF
   ATH_CHECK(m_forwardGsfFitter.retrieve());
 
   // Request the GSF smoother - hardwired type and instance name for the GSF
   ATH_CHECK(m_gsfSmoother.retrieve());
 
-  // Request the GSF measurement updator - hardwired type and instance name for the GSF
+  // Request the GSF measurement updator - hardwired type and instance name for
+  // the GSF
   ATH_CHECK(m_updator.retrieve());
 
   // Request the GSF extrapolator
   ATH_CHECK(m_extrapolator.retrieve());
 
   // Request the RIO_OnTrack creator
-  // No need to return if RioOnTrack creator tool, only if PrepRawData is used in fit
+  // No need to return if RioOnTrack creator tool, only if PrepRawData is used
+  // in fit
   if (m_rioOnTrackCreator.retrieve().isFailure()) {
 
     if (!m_refitOnMeasurementBase) {
-      ATH_MSG_FATAL("Attempting to use PrepRawData with no RIO_OnTrack creator tool provided... Exiting!");
+      ATH_MSG_FATAL("Attempting to use PrepRawData with no RIO_OnTrack creator "
+                    "tool provided... Exiting!");
       return StatusCode::FAILURE;
-    } else {
-      ATH_MSG_INFO("Request to retrieve the RIO_OnTrack Creator"
-                   << "failed but track is fit at the MeasurementBase level... Continuing!");
     }
+    ATH_MSG_INFO(
+      "Request to retrieve the RIO_OnTrack Creator"
+      << "failed but track is fit at the MeasurementBase level... Continuing!");
   }
 
   // Initialise the closest track parameters search algorithm
-  Amg::Vector3D referencePosition(m_sortingReferencePoint[0], m_sortingReferencePoint[1], m_sortingReferencePoint[2]);
+  Amg::Vector3D referencePosition(m_sortingReferencePoint[0],
+                                  m_sortingReferencePoint[1],
+                                  m_sortingReferencePoint[2]);
 
-  m_trkParametersComparisonFunction = new Trk::TrkParametersComparisonFunction(referencePosition);
+  m_trkParametersComparisonFunction =
+    new Trk::TrkParametersComparisonFunction(referencePosition);
 
   if (!m_trkParametersComparisonFunction) {
-    ATH_MSG_FATAL("Request to instansiate the ClosestTrackParametersFinder object failed... Exiting!");
+    ATH_MSG_FATAL("Request to instansiate the ClosestTrackParametersFinder "
+                  "object failed... Exiting!");
     return StatusCode::FAILURE;
   }
 
   // Configure forward fitter
-  sc = m_forwardGsfFitter->configureTools(m_extrapolator, m_updator, m_rioOnTrackCreator);
+  sc = m_forwardGsfFitter->configureTools(
+    m_extrapolator, m_updator, m_rioOnTrackCreator);
 
   if (sc.isFailure()) {
     ATH_MSG_FATAL("Could not configure the forwards GSF fitter... Exiting!");
@@ -158,12 +170,18 @@ Trk::GaussianSumFitter::finalize()
   msg(MSG::INFO) << "            Some Brief GSF Statistics          " << endmsg;
   msg(MSG::INFO) << "-----------------------------------------------" << endmsg;
 
-  msg(MSG::INFO) << "Number of Fit PrepRawData Calls:          " << m_FitPRD << endmsg;
-  msg(MSG::INFO) << "Number of Fit MeasurementBase Calls:      " << m_FitMeasurementBase << endmsg;
-  msg(MSG::INFO) << "Number of Forward Fit Failures:           " << m_ForwardFailure << endmsg;
-  msg(MSG::INFO) << "Number of Smoother Failures:              " << m_SmootherFailure << endmsg;
-  msg(MSG::INFO) << "Number of MakePerigee Failures:           " << m_PerigeeFailure << endmsg;
-  msg(MSG::INFO) << "Number of Trks that fail fitquality test: " << m_fitQualityFailure << endmsg;
+  msg(MSG::INFO) << "Number of Fit PrepRawData Calls:          " << m_FitPRD
+                 << endmsg;
+  msg(MSG::INFO) << "Number of Fit MeasurementBase Calls:      "
+                 << m_FitMeasurementBase << endmsg;
+  msg(MSG::INFO) << "Number of Forward Fit Failures:           "
+                 << m_ForwardFailure << endmsg;
+  msg(MSG::INFO) << "Number of Smoother Failures:              "
+                 << m_SmootherFailure << endmsg;
+  msg(MSG::INFO) << "Number of MakePerigee Failures:           "
+                 << m_PerigeeFailure << endmsg;
+  msg(MSG::INFO) << "Number of Trks that fail fitquality test: "
+                 << m_fitQualityFailure << endmsg;
   msg(MSG::INFO) << "-----------------------------------------------" << endmsg;
 
   msg(MSG::INFO) << "Finalisation of " << name() << " was successful" << endmsg;
@@ -177,35 +195,44 @@ Trk::GaussianSumFitter::finalize()
 */
 
 Trk::Track*
-Trk::GaussianSumFitter::fit(const Trk::Track& inputTrack,
-                            const Trk::RunOutlierRemoval outlierRemoval,
-                            const Trk::ParticleHypothesis particleHypothesis) const
+Trk::GaussianSumFitter::fit(
+  const Trk::Track& inputTrack,
+  const Trk::RunOutlierRemoval outlierRemoval,
+  const Trk::ParticleHypothesis particleHypothesis) const
 {
 
-  if (msgLvl(MSG::VERBOSE))
+  if (msgLvl(MSG::VERBOSE)) {
     msg() << "Trk::GaussianSumFilter::fit() - Refitting a track" << endmsg;
+  }
 
   // Start the timer
   Chrono chrono(&(*m_chronoSvc), name());
 
   // Check that the input track has well defined parameters
   if (inputTrack.trackParameters()->empty()) {
-    msg(MSG::FATAL) << "No estimation of track parameters near origin... Exiting!" << endmsg;
+    msg(MSG::FATAL)
+      << "No estimation of track parameters near origin... Exiting!" << endmsg;
     return nullptr;
   }
 
   // Check that the input track has associated MeasurementBase objects
   if (inputTrack.trackStateOnSurfaces()->empty()) {
-    msg(MSG::FATAL) << "Attempting to fit track to empty MeasurementBase collection... Exiting!" << endmsg;
+    msg(MSG::FATAL) << "Attempting to fit track to empty MeasurementBase "
+                       "collection... Exiting!"
+                    << endmsg;
     return nullptr;
   }
 
   // Retrieve the set of track parameters closest to the reference point
-  const Trk::TrackParameters* parametersNearestReference = *(std::min_element(
-    inputTrack.trackParameters()->begin(), inputTrack.trackParameters()->end(), *m_trkParametersComparisonFunction));
+  const Trk::TrackParameters* parametersNearestReference =
+    *(std::min_element(inputTrack.trackParameters()->begin(),
+                       inputTrack.trackParameters()->end(),
+                       *m_trkParametersComparisonFunction));
 
-  if (msgLvl(MSG::VERBOSE))
-    msg() << "Estimation parameters near reference point: " << *parametersNearestReference << endmsg;
+  if (msgLvl(MSG::VERBOSE)) {
+    msg() << "Estimation parameters near reference point: "
+          << *parametersNearestReference << endmsg;
+  }
 
   // If refitting of track is at the MeasurementBase level
   // extract the MeasurementBase from the input track and create a new vector
@@ -213,70 +240,82 @@ Trk::GaussianSumFitter::fit(const Trk::Track& inputTrack,
 
     MeasurementSet measurementSet;
 
-    DataVector<const Trk::TrackStateOnSurface>::const_iterator trackStateOnSurface =
-      inputTrack.trackStateOnSurfaces()->begin();
-    for (; trackStateOnSurface != inputTrack.trackStateOnSurfaces()->end(); ++trackStateOnSurface) {
+    DataVector<const Trk::TrackStateOnSurface>::const_iterator
+      trackStateOnSurface = inputTrack.trackStateOnSurfaces()->begin();
+    for (; trackStateOnSurface != inputTrack.trackStateOnSurfaces()->end();
+         ++trackStateOnSurface) {
 
       if (!(*trackStateOnSurface)) {
-        ATH_MSG_WARNING("This track contains an empty MeasurementBase object that won't be included in the fit");
+        ATH_MSG_WARNING("This track contains an empty MeasurementBase object "
+                        "that won't be included in the fit");
         continue;
       }
 
       if ((*trackStateOnSurface)->measurementOnTrack()) {
         if ((*trackStateOnSurface)->type(TrackStateOnSurface::Measurement)) {
-          measurementSet.push_back((*trackStateOnSurface)->measurementOnTrack());
-        } else if (m_reintegrateOutliers && (*trackStateOnSurface)->type(TrackStateOnSurface::Outlier)) {
-          measurementSet.push_back((*trackStateOnSurface)->measurementOnTrack());
+          measurementSet.push_back(
+            (*trackStateOnSurface)->measurementOnTrack());
+        } else if (m_reintegrateOutliers &&
+                   (*trackStateOnSurface)->type(TrackStateOnSurface::Outlier)) {
+          measurementSet.push_back(
+            (*trackStateOnSurface)->measurementOnTrack());
         }
       }
     }
 
     // Apply GSF fit to MeasurementBase objects
-    return fit(measurementSet, *parametersNearestReference, outlierRemoval, particleHypothesis);
-
+    return fit(measurementSet,
+               *parametersNearestReference,
+               outlierRemoval,
+               particleHypothesis);
   }
 
-  // If refitting of the track is at the PrepRawData level then extract the PrepRawData objects from
-  // the input track
-  else {
-
-    PrepRawDataSet prepRawDataSet;
+  // If refitting of the track is at the PrepRawData level then extract the
+  // PrepRawData objects from the input track
 
-    DataVector<const Trk::MeasurementBase>::const_iterator measurementOnTrack =
-      inputTrack.measurementsOnTrack()->begin();
+  PrepRawDataSet prepRawDataSet;
 
-    for (; measurementOnTrack != inputTrack.measurementsOnTrack()->end(); ++measurementOnTrack) {
+  DataVector<const Trk::MeasurementBase>::const_iterator measurementOnTrack =
+    inputTrack.measurementsOnTrack()->begin();
 
-      if (!(*measurementOnTrack)) {
-        ATH_MSG_DEBUG("This track contains an empty MeasurementBase object... Ignoring object");
-        continue;
-      }
+  for (; measurementOnTrack != inputTrack.measurementsOnTrack()->end();
+       ++measurementOnTrack) {
 
-      // Dynamic cast to a RIO_OnTrack object
-      const Trk::RIO_OnTrack* rioOnTrack = nullptr;
-      if ((*measurementOnTrack)->type(Trk::MeasurementBaseType::RIO_OnTrack)) {
-        rioOnTrack = static_cast<const Trk::RIO_OnTrack*>(*measurementOnTrack);
-      }
+    if (!(*measurementOnTrack)) {
+      ATH_MSG_DEBUG("This track contains an empty MeasurementBase object... "
+                    "Ignoring object");
+      continue;
+    }
 
-      if (!rioOnTrack) {
-        ATH_MSG_DEBUG("Measurement could not be cast as a RIO_OnTrack object... continuing");
-        continue;
-      }
+    // Dynamic cast to a RIO_OnTrack object
+    const Trk::RIO_OnTrack* rioOnTrack = nullptr;
+    if ((*measurementOnTrack)->type(Trk::MeasurementBaseType::RIO_OnTrack)) {
+      rioOnTrack = static_cast<const Trk::RIO_OnTrack*>(*measurementOnTrack);
+    }
 
-      const PrepRawData* prepRawData = rioOnTrack->prepRawData();
+    if (!rioOnTrack) {
+      ATH_MSG_DEBUG(
+        "Measurement could not be cast as a RIO_OnTrack object... continuing");
+      continue;
+    }
 
-      if (!prepRawData) {
-        ATH_MSG_DEBUG("Defined RIO_OnTrack object has no associated PrepRawData object..."
-                      << "this object will be ignored in fit");
-        continue;
-      }
+    const PrepRawData* prepRawData = rioOnTrack->prepRawData();
 
-      prepRawDataSet.push_back(prepRawData);
+    if (!prepRawData) {
+      ATH_MSG_DEBUG(
+        "Defined RIO_OnTrack object has no associated PrepRawData object..."
+        << "this object will be ignored in fit");
+      continue;
     }
 
-    // Apply GSF fit to PrepRawData objects
-    return fit(prepRawDataSet, *parametersNearestReference, outlierRemoval, particleHypothesis);
+    prepRawDataSet.push_back(prepRawData);
   }
+
+  // Apply GSF fit to PrepRawData objects
+  return fit(prepRawDataSet,
+             *parametersNearestReference,
+             outlierRemoval,
+             particleHypothesis);
 }
 
 /* ==================================================================================================================
@@ -285,16 +324,18 @@ Trk::GaussianSumFitter::fit(const Trk::Track& inputTrack,
 */
 
 Trk::Track*
-Trk::GaussianSumFitter::fit(const Trk::PrepRawDataSet& prepRawDataSet,
-                            const Trk::TrackParameters& estimatedParametersNearOrigin,
-                            const Trk::RunOutlierRemoval outlierRemoval,
-                            const Trk::ParticleHypothesis particleHypothesis) const
+Trk::GaussianSumFitter::fit(
+  const Trk::PrepRawDataSet& prepRawDataSet,
+  const Trk::TrackParameters& estimatedParametersNearOrigin,
+  const Trk::RunOutlierRemoval outlierRemoval,
+  const Trk::ParticleHypothesis particleHypothesis) const
 {
 
-  ATH_MSG_VERBOSE("Trk::GaussianSumFilter::fit() - Fitting a set of PrepRawData objects"
-                  << '\n'
-                  << "Material effects switch: " << particleHypothesis << '\n'
-                  << "Outlier removal switch:  " << outlierRemoval);
+  ATH_MSG_VERBOSE(
+    "Trk::GaussianSumFilter::fit() - Fitting a set of PrepRawData objects"
+    << '\n'
+    << "Material effects switch: " << particleHypothesis << '\n'
+    << "Outlier removal switch:  " << outlierRemoval);
 
   ++m_FitPRD;
 
@@ -307,20 +348,28 @@ Trk::GaussianSumFitter::fit(const Trk::PrepRawDataSet& prepRawDataSet,
     return nullptr;
   }
 
-  // A const stl container cannot be sorted. This will re-cast it so that it can.
+  // A const stl container cannot be sorted. This will re-cast it so that it
+  // can.
   Trk::PrepRawDataSet sortedPrepRawDataSet = PrepRawDataSet(prepRawDataSet);
 
   if (m_doHitSorting) {
-    Trk::PrepRawDataComparisonFunction* prdComparisonFunction = new Trk::PrepRawDataComparisonFunction(
-      estimatedParametersNearOrigin.position(), estimatedParametersNearOrigin.momentum());
-    std::sort(sortedPrepRawDataSet.begin(), sortedPrepRawDataSet.end(), *prdComparisonFunction);
+    Trk::PrepRawDataComparisonFunction* prdComparisonFunction =
+      new Trk::PrepRawDataComparisonFunction(
+        estimatedParametersNearOrigin.position(),
+        estimatedParametersNearOrigin.momentum());
+    std::sort(sortedPrepRawDataSet.begin(),
+              sortedPrepRawDataSet.end(),
+              *prdComparisonFunction);
 
     delete prdComparisonFunction;
   }
 
   // Perform GSF forwards fit
   ForwardTrajectory* forwardTrajectory =
-    m_forwardGsfFitter->fitPRD(sortedPrepRawDataSet, estimatedParametersNearOrigin, particleHypothesis).release();
+    m_forwardGsfFitter
+      ->fitPRD(
+        sortedPrepRawDataSet, estimatedParametersNearOrigin, particleHypothesis)
+      .release();
 
   if (!forwardTrajectory) {
     ATH_MSG_DEBUG("Forward GSF fit failed... Exiting!");
@@ -338,7 +387,8 @@ Trk::GaussianSumFitter::fit(const Trk::PrepRawDataSet& prepRawDataSet,
   ATH_MSG_VERBOSE("*** Forward GSF fit passed! ***");
 
   // Perform GSF smoother operation
-  SmoothedTrajectory* smoothedTrajectory = m_gsfSmoother->fit(*forwardTrajectory, particleHypothesis);
+  SmoothedTrajectory* smoothedTrajectory =
+    m_gsfSmoother->fit(*forwardTrajectory, particleHypothesis);
 
   // Protect against failed smoother fit
   if (!smoothedTrajectory) {
@@ -364,16 +414,18 @@ Trk::GaussianSumFitter::fit(const Trk::PrepRawDataSet& prepRawDataSet,
   Track* fittedTrack = nullptr;
 
   if (outlierRemoval) {
-    ATH_MSG_DEBUG("Outlier removal not yet implemented for the Gaussian Sum Filter");
+    ATH_MSG_DEBUG(
+      "Outlier removal not yet implemented for the Gaussian Sum Filter");
   }
 
   if (m_makePerigee) {
     const Trk::MultiComponentStateOnSurface* perigeeMultiStateOnSurface =
       this->makePerigee(smoothedTrajectory, particleHypothesis);
-    ATH_MSG_DEBUG("perigeeMultiStateOnSurface  :" << perigeeMultiStateOnSurface);
-    if (perigeeMultiStateOnSurface)
+    ATH_MSG_DEBUG(
+      "perigeeMultiStateOnSurface  :" << perigeeMultiStateOnSurface);
+    if (perigeeMultiStateOnSurface) {
       smoothedTrajectory->push_back(perigeeMultiStateOnSurface);
-    else {
+    } else {
       ATH_MSG_DEBUG("Perigee asked to be created but failed.....Exiting");
       ++m_PerigeeFailure;
       delete smoothedTrajectory;
@@ -397,8 +449,10 @@ Trk::GaussianSumFitter::fit(const Trk::PrepRawDataSet& prepRawDataSet,
   if (fittedTrack) {
     ATH_MSG_VERBOSE("Fitting of a set of PrepRawData objects is successful"
                     << '\n'
-                    << "Track fit chi squared... " << fitQuality->chiSquared() << '\n'
-                    << "Track fit number of degrees of freedom... " << fitQuality->numberDoF());
+                    << "Track fit chi squared... " << fitQuality->chiSquared()
+                    << '\n'
+                    << "Track fit number of degrees of freedom... "
+                    << fitQuality->numberDoF());
   } else {
     ATH_MSG_DEBUG("Trk::GaussianSumFilter::fit() failed!");
   }
@@ -407,23 +461,26 @@ Trk::GaussianSumFitter::fit(const Trk::PrepRawDataSet& prepRawDataSet,
 
 /* ================================================================================================
    Fitting of a set of MeasurementBase objects
-============== ====================================================================================
+==============
+====================================================================================
 */
 
 Trk::Track*
-Trk::GaussianSumFitter::fit(const Trk::MeasurementSet& measurementSet,
-                            const Trk::TrackParameters& estimatedParametersNearOrigin,
-                            const Trk::RunOutlierRemoval outlierRemoval,
-                            const Trk::ParticleHypothesis particleHypothesis) const
+Trk::GaussianSumFitter::fit(
+  const Trk::MeasurementSet& measurementSet,
+  const Trk::TrackParameters& estimatedParametersNearOrigin,
+  const Trk::RunOutlierRemoval outlierRemoval,
+  const Trk::ParticleHypothesis particleHypothesis) const
 {
 
   // Start the timer
   Chrono chrono(&(*m_chronoSvc), name());
 
-  ATH_MSG_VERBOSE("Trk::GaussianSumFilter::fit() - Fitting a set of MeasurementBase objects"
-                  << '\n'
-                  << "Material effects switch: " << particleHypothesis << '\n'
-                  << "Outlier removal switch:  " << outlierRemoval);
+  ATH_MSG_VERBOSE(
+    "Trk::GaussianSumFilter::fit() - Fitting a set of MeasurementBase objects"
+    << '\n'
+    << "Material effects switch: " << particleHypothesis << '\n'
+    << "Outlier removal switch:  " << outlierRemoval);
 
   ++m_FitMeasurementBase;
   // Protect against empty PrepRawDataSet object
@@ -440,7 +497,8 @@ Trk::GaussianSumFitter::fit(const Trk::MeasurementSet& measurementSet,
   MeasurementSet::const_iterator itSetEnd = measurementSet.end();
   for (; itSet != itSetEnd; ++itSet) {
     if (!(*itSet)) {
-      ATH_MSG_WARNING("There is an empty MeasurementBase object in the track! Skip this object..");
+      ATH_MSG_WARNING("There is an empty MeasurementBase object in the track! "
+                      "Skip this object..");
     } else {
       ccot = nullptr;
       if ((*itSet)->type(Trk::MeasurementBaseType::CaloCluster_OnTrack)) {
@@ -449,23 +507,31 @@ Trk::GaussianSumFitter::fit(const Trk::MeasurementSet& measurementSet,
       if (!ccot) {
         cleanedMeasurementSet.push_back(*itSet);
       } else {
-        ATH_MSG_DEBUG("The  MeasurementBase object is a Trk::CaloCluster_OnTrack");
+        ATH_MSG_DEBUG(
+          "The  MeasurementBase object is a Trk::CaloCluster_OnTrack");
       }
     }
   }
 
-  // A const stl container cannot be sorted. This will re-cast it so that it can.
-  Trk::MeasurementSet sortedMeasurementSet = MeasurementSet(cleanedMeasurementSet);
+  // A const stl container cannot be sorted. This will re-cast it so that it
+  // can.
+  Trk::MeasurementSet sortedMeasurementSet =
+    MeasurementSet(cleanedMeasurementSet);
 
   if (m_doHitSorting) {
 
-    Trk::MeasurementBaseComparisonFunction measurementBaseComparisonFunction(estimatedParametersNearOrigin.position(),
-                                                                             estimatedParametersNearOrigin.momentum());
-    sort(sortedMeasurementSet.begin(), sortedMeasurementSet.end(), measurementBaseComparisonFunction);
+    Trk::MeasurementBaseComparisonFunction measurementBaseComparisonFunction(
+      estimatedParametersNearOrigin.position(),
+      estimatedParametersNearOrigin.momentum());
+    sort(sortedMeasurementSet.begin(),
+         sortedMeasurementSet.end(),
+         measurementBaseComparisonFunction);
   }
   // Perform GSF forwards fit - new memory allocated in forwards fitter
   ForwardTrajectory* forwardTrajectory =
-    m_forwardGsfFitter->fitMeasurements(sortedMeasurementSet, estimatedParametersNearOrigin, particleHypothesis)
+    m_forwardGsfFitter
+      ->fitMeasurements(
+        sortedMeasurementSet, estimatedParametersNearOrigin, particleHypothesis)
       .release();
 
   if (!forwardTrajectory) {
@@ -484,7 +550,8 @@ Trk::GaussianSumFitter::fit(const Trk::MeasurementSet& measurementSet,
   ATH_MSG_VERBOSE("*** Forward GSF fit passed! ***");
 
   // Perform GSF smoother operation
-  SmoothedTrajectory* smoothedTrajectory = m_gsfSmoother->fit(*forwardTrajectory, particleHypothesis, ccot);
+  SmoothedTrajectory* smoothedTrajectory =
+    m_gsfSmoother->fit(*forwardTrajectory, particleHypothesis, ccot);
 
   // Protect against failed smoother fit
   if (!smoothedTrajectory) {
@@ -507,16 +574,18 @@ Trk::GaussianSumFitter::fit(const Trk::MeasurementSet& measurementSet,
   }
 
   if (outlierRemoval) {
-    ATH_MSG_DEBUG("Outlier removal not yet implemented for the Gaussian Sum Filter");
+    ATH_MSG_DEBUG(
+      "Outlier removal not yet implemented for the Gaussian Sum Filter");
   }
   if (m_makePerigee) {
     const Trk::MultiComponentStateOnSurface* perigeeMultiStateOnSurface =
       this->makePerigee(smoothedTrajectory, particleHypothesis);
-    ATH_MSG_DEBUG("perigeeMultiStateOnSurface  :" << perigeeMultiStateOnSurface);
+    ATH_MSG_DEBUG(
+      "perigeeMultiStateOnSurface  :" << perigeeMultiStateOnSurface);
 
-    if (perigeeMultiStateOnSurface)
+    if (perigeeMultiStateOnSurface) {
       smoothedTrajectory->push_back(perigeeMultiStateOnSurface);
-    else {
+    } else {
       ATH_MSG_DEBUG("Perigee asked to be created but failed.....Exiting");
       ++m_PerigeeFailure;
       delete fitQuality;
@@ -541,8 +610,10 @@ Trk::GaussianSumFitter::fit(const Trk::MeasurementSet& measurementSet,
   if (fittedTrack) {
     ATH_MSG_DEBUG("Fitting of a set of MeasurementBase objects is successful"
                   << '\n'
-                  << "Track fit chi squared... " << fitQuality->chiSquared() << '\n'
-                  << "Track fit number of degrees of freedom... " << fitQuality->numberDoF());
+                  << "Track fit chi squared... " << fitQuality->chiSquared()
+                  << '\n'
+                  << "Track fit number of degrees of freedom... "
+                  << fitQuality->numberDoF());
   } else {
     ATH_MSG_DEBUG("Trk::GaussianSumFilter::fit() failed!");
   }
@@ -558,32 +629,38 @@ Trk::GaussianSumFitter::fit(const Track& intrk,
 
   ATH_MSG_VERBOSE("--> enter GaussianSumFitter::fit(Track,PrdSet,,)"
                   << '\n'
-                  << "    with Track from author = " << intrk.info().dumpInfo());
+                  << "    with Track from author = "
+                  << intrk.info().dumpInfo());
 
   // protection, if empty PrepRawDataSet
   if (addPrdColl.empty()) {
-    ATH_MSG_WARNING("client tries to add an empty PrepRawDataSet to the track fit.");
+    ATH_MSG_WARNING(
+      "client tries to add an empty PrepRawDataSet to the track fit.");
     return fit(intrk, runOutlier, matEffects);
   }
 
   /*  determine the Track Parameter which is the start of the trajectory,
       i.e. closest to the reference point */
-  ATH_MSG_DEBUG("get track parameters near origin " << (m_doHitSorting ? "via STL sort" : "from 1st state"));
+  ATH_MSG_DEBUG("get track parameters near origin "
+                << (m_doHitSorting ? "via STL sort" : "from 1st state"));
 
   const TrackParameters* estimatedStartParameters =
-    m_doHitSorting
-      ? *(std::min_element(
-          intrk.trackParameters()->begin(), intrk.trackParameters()->end(), *m_trkParametersComparisonFunction))
-      : *intrk.trackParameters()->begin();
+    m_doHitSorting ? *(std::min_element(intrk.trackParameters()->begin(),
+                                        intrk.trackParameters()->end(),
+                                        *m_trkParametersComparisonFunction))
+                   : *intrk.trackParameters()->begin();
 
   // use external preparator class to prepare PRD set for fitter interface
 
-  Amg::Vector3D referencePosition(m_sortingReferencePoint[0], m_sortingReferencePoint[1], m_sortingReferencePoint[2]);
+  Amg::Vector3D referencePosition(m_sortingReferencePoint[0],
+                                  m_sortingReferencePoint[1],
+                                  m_sortingReferencePoint[2]);
 
-  TrackFitInputPreparator* inputPreparator = new TrackFitInputPreparator(referencePosition);
+  TrackFitInputPreparator* inputPreparator =
+    new TrackFitInputPreparator(referencePosition);
 
-  PrepRawDataSet orderedPRDColl =
-    inputPreparator->stripPrepRawData(intrk, addPrdColl, m_doHitSorting, true /* do not lose outliers! */);
+  PrepRawDataSet orderedPRDColl = inputPreparator->stripPrepRawData(
+    intrk, addPrdColl, m_doHitSorting, true /* do not lose outliers! */);
 
   delete inputPreparator;
 
@@ -597,11 +674,13 @@ Trk::GaussianSumFitter::fit(const Track& inputTrack,
                             const ParticleHypothesis matEffects) const
 {
 
-  ATH_MSG_VERBOSE("Trk::GaussianSumFilter::fit() - Refitting a track with a additional information ");
+  ATH_MSG_VERBOSE("Trk::GaussianSumFilter::fit() - Refitting a track with a "
+                  "additional information ");
 
   // protection, if empty MeasurementSet
   if (measurementSet.empty()) {
-    ATH_MSG_WARNING("Client tries to add an empty MeasurementSet to the track fit.");
+    ATH_MSG_WARNING(
+      "Client tries to add an empty MeasurementSet to the track fit.");
     return fit(inputTrack, runOutlier, matEffects);
   }
 
@@ -613,15 +692,19 @@ Trk::GaussianSumFitter::fit(const Track& inputTrack,
 
   // Check that the input track has associated MeasurementBase objects
   if (inputTrack.trackStateOnSurfaces()->empty()) {
-    ATH_MSG_FATAL("Attempting to fit track to empty MeasurementBase collection... Exiting!");
+    ATH_MSG_FATAL("Attempting to fit track to empty MeasurementBase "
+                  "collection... Exiting!");
     return nullptr;
   }
 
   // Retrieve the set of track parameters closest to the reference point
-  const Trk::TrackParameters* parametersNearestReference = *(std::min_element(
-    inputTrack.trackParameters()->begin(), inputTrack.trackParameters()->end(), *m_trkParametersComparisonFunction));
+  const Trk::TrackParameters* parametersNearestReference =
+    *(std::min_element(inputTrack.trackParameters()->begin(),
+                       inputTrack.trackParameters()->end(),
+                       *m_trkParametersComparisonFunction));
 
-  MeasurementSet combinedMS = m_inputPreparator->stripMeasurements(inputTrack, measurementSet, true, false);
+  MeasurementSet combinedMS = m_inputPreparator->stripMeasurements(
+    inputTrack, measurementSet, true, false);
 
   // Apply GSF fit to MeasurementBase objects
   return fit(combinedMS, *parametersNearestReference, runOutlier, matEffects);
@@ -635,21 +718,30 @@ Trk::GaussianSumFitter::fit(const Track& intrk1,
 {
   // Not a great implementation but simple...  Just add the hits on track
   // protection against not having measurements on the input tracks
-  if (!intrk1.trackStateOnSurfaces() || !intrk2.trackStateOnSurfaces() || intrk1.trackStateOnSurfaces()->size() < 2) {
-    msg(MSG::WARNING) << "called to refit empty track or track with too little information, reject fit" << endmsg;
+  if (!intrk1.trackStateOnSurfaces() || !intrk2.trackStateOnSurfaces() ||
+      intrk1.trackStateOnSurfaces()->size() < 2) {
+    msg(MSG::WARNING) << "called to refit empty track or track with too little "
+                         "information, reject fit"
+                      << endmsg;
     return nullptr;
   }
 
   if (!intrk1.trackParameters() || intrk1.trackParameters()->empty()) {
-    msg(MSG::WARNING) << "input #1 fails to provide track parameters for seeding the GXF, reject fit" << endmsg;
+    msg(MSG::WARNING) << "input #1 fails to provide track parameters for "
+                         "seeding the GXF, reject fit"
+                      << endmsg;
     return nullptr;
   }
 
   const TrackParameters* minPar = *intrk1.trackParameters()->begin();
-  DataVector<const TrackStateOnSurface>::const_iterator itStates = intrk1.trackStateOnSurfaces()->begin();
-  DataVector<const TrackStateOnSurface>::const_iterator endState = intrk1.trackStateOnSurfaces()->end();
-  DataVector<const TrackStateOnSurface>::const_iterator itStates2 = intrk2.trackStateOnSurfaces()->begin();
-  DataVector<const TrackStateOnSurface>::const_iterator endState2 = intrk2.trackStateOnSurfaces()->end();
+  DataVector<const TrackStateOnSurface>::const_iterator itStates =
+    intrk1.trackStateOnSurfaces()->begin();
+  DataVector<const TrackStateOnSurface>::const_iterator endState =
+    intrk1.trackStateOnSurfaces()->end();
+  DataVector<const TrackStateOnSurface>::const_iterator itStates2 =
+    intrk2.trackStateOnSurfaces()->begin();
+  DataVector<const TrackStateOnSurface>::const_iterator endState2 =
+    intrk2.trackStateOnSurfaces()->end();
 
   Trk::MeasurementSet ms;
 
@@ -659,7 +751,8 @@ Trk::GaussianSumFitter::fit(const Track& intrk1,
       continue;
     }
 
-    if ((*itStates)->measurementOnTrack()->type(Trk::MeasurementBaseType::PseudoMeasurementOnTrack)) {
+    if ((*itStates)->measurementOnTrack()->type(
+          Trk::MeasurementBaseType::PseudoMeasurementOnTrack)) {
       continue;
     }
 
@@ -673,7 +766,9 @@ Trk::GaussianSumFitter::fit(const Track& intrk1,
       continue;
     }
 
-    if ((*itStates2)->measurementOnTrack()->type(Trk::MeasurementBaseType::PseudoMeasurementOnTrack)) {
+    if ((*itStates2)
+          ->measurementOnTrack()
+          ->type(Trk::MeasurementBaseType::PseudoMeasurementOnTrack)) {
       continue;
     }
 
@@ -684,25 +779,31 @@ Trk::GaussianSumFitter::fit(const Track& intrk1,
 }
 
 const Trk::MultiComponentStateOnSurface*
-Trk::GaussianSumFitter::makePerigee(const Trk::SmoothedTrajectory* smoothedTrajectory,
-                                    const Trk::ParticleHypothesis particleHypothesis) const
+Trk::GaussianSumFitter::makePerigee(
+  const Trk::SmoothedTrajectory* smoothedTrajectory,
+  const Trk::ParticleHypothesis particleHypothesis) const
 {
 
   // Propagate track to perigee
   const Trk::PerigeeSurface perigeeSurface;
-  const Trk::TrackStateOnSurface* stateOnSurfaceNearestOrigin = smoothedTrajectory->back();
-  const Trk::MultiComponentStateOnSurface* multiComponentStateOnSurfaceNearestOrigin =
-    dynamic_cast<const Trk::MultiComponentStateOnSurface*>(stateOnSurfaceNearestOrigin);
+  const Trk::TrackStateOnSurface* stateOnSurfaceNearestOrigin =
+    smoothedTrajectory->back();
+  const Trk::MultiComponentStateOnSurface*
+    multiComponentStateOnSurfaceNearestOrigin =
+      dynamic_cast<const Trk::MultiComponentStateOnSurface*>(
+        stateOnSurfaceNearestOrigin);
 
   const Trk::MultiComponentState* multiComponentState = nullptr;
   if (!multiComponentStateOnSurfaceNearestOrigin) {
     // we need to make a dummy multicomponent surface
-    Trk::ComponentParameters dummyComponent(stateOnSurfaceNearestOrigin->trackParameters()->clone(), 1.);
+    Trk::ComponentParameters dummyComponent(
+      stateOnSurfaceNearestOrigin->trackParameters()->clone(), 1.);
     auto tmp_multiComponentState = std::make_unique<Trk::MultiComponentState>();
     tmp_multiComponentState->push_back(std::move(dummyComponent));
     multiComponentState = tmp_multiComponentState.release();
   } else {
-    multiComponentState = multiComponentStateOnSurfaceNearestOrigin->components();
+    multiComponentState =
+      multiComponentStateOnSurfaceNearestOrigin->components();
   }
   // Extrapolate to perigee, taking material effects considerations into account
   Trk::MultiComponentState stateExtrapolatedToPerigee =
@@ -728,38 +829,45 @@ Trk::GaussianSumFitter::makePerigee(const Trk::SmoothedTrajectory* smoothedTraje
   double modeQoverP = 0;
 
   if (modeQoverP) {
-    ATH_MSG_VERBOSE("Calculated mode is stored by default in the Perigee Parameters"
-                    << "and is NO Longer Stored as a seperate Parameter");
+    ATH_MSG_VERBOSE(
+      "Calculated mode is stored by default in the Perigee Parameters"
+      << "and is NO Longer Stored as a seperate Parameter");
   }
-  // Determine the combined state as well to be passed to the MultiComponentStateOnSurface object
+  // Determine the combined state as well to be passed to the
+  // MultiComponentStateOnSurface object
   std::unique_ptr<Trk::TrackParameters> combinedPerigee =
     MultiComponentStateCombiner::combine(stateExtrapolatedToPerigee, true);
 
   // Perigee is given as an additional MultiComponentStateOnSurface
-  std::bitset<Trk::TrackStateOnSurface::NumberOfTrackStateOnSurfaceTypes> pattern(0);
+  std::bitset<Trk::TrackStateOnSurface::NumberOfTrackStateOnSurfaceTypes>
+    pattern(0);
   pattern.set(Trk::TrackStateOnSurface::Perigee);
 
   if (fabs(combinedPerigee->parameters()[Trk::qOverP]) > 1e8) {
-    // GC: protection against 0-momentum track .. this check should NEVER be needed.
+    // GC: protection against 0-momentum track .. this check should NEVER be
+    // needed.
     //    actual cutoff is 0.01eV track
-    ATH_MSG_ERROR("makePerigee() about to return with 0 momentum!! Returning null instead");
+    ATH_MSG_ERROR(
+      "makePerigee() about to return with 0 momentum!! Returning null instead");
     return nullptr;
   }
 
   const Trk::MultiComponentStateOnSurface* perigeeMultiStateOnSurface =
-    new MultiComponentStateOnSurface(nullptr,
-                                     combinedPerigee.release(),
-                                     MultiComponentStateHelpers::clone(stateExtrapolatedToPerigee).release(),
-                                     nullptr,
-                                     nullptr,
-                                     pattern,
-                                     modeQoverP);
+    new MultiComponentStateOnSurface(
+      nullptr,
+      combinedPerigee.release(),
+      MultiComponentStateHelpers::clone(stateExtrapolatedToPerigee).release(),
+      nullptr,
+      nullptr,
+      pattern,
+      modeQoverP);
   ATH_MSG_DEBUG("makePerigee() returning sucessfully!");
   return perigeeMultiStateOnSurface;
 }
 
 const Trk::FitQuality*
-Trk::GaussianSumFitter::buildFitQuality(const Trk::SmoothedTrajectory& smoothedTrajectory) const
+Trk::GaussianSumFitter::buildFitQuality(
+  const Trk::SmoothedTrajectory& smoothedTrajectory) const
 {
 
   ATH_MSG_VERBOSE("Gsf fitQuality");
@@ -767,21 +875,25 @@ Trk::GaussianSumFitter::buildFitQuality(const Trk::SmoothedTrajectory& smoothedT
   int numberDoF = -5;
 
   // Loop over all TrackStateOnSurface objects in trajectory
-  SmoothedTrajectory::const_iterator stateOnSurface = smoothedTrajectory.begin();
+  SmoothedTrajectory::const_iterator stateOnSurface =
+    smoothedTrajectory.begin();
 
   for (; stateOnSurface != smoothedTrajectory.end(); ++stateOnSurface) {
 
-    if (!(*stateOnSurface)->type(TrackStateOnSurface::Measurement))
+    if (!(*stateOnSurface)->type(TrackStateOnSurface::Measurement)) {
       continue;
-    if ((*stateOnSurface)->fitQualityOnSurface() == nullptr)
+    }
+    if ((*stateOnSurface)->fitQualityOnSurface() == nullptr) {
       continue;
+    }
 
     chiSquared += (*stateOnSurface)->fitQualityOnSurface()->chiSquared();
     numberDoF += (*stateOnSurface)->fitQualityOnSurface()->numberDoF();
   }
 
-  if (std::isnan(chiSquared) || chiSquared <= 0.)
+  if (std::isnan(chiSquared) || chiSquared <= 0.) {
     return nullptr;
+  }
 
   const FitQuality* fitQuality = new FitQuality(chiSquared, numberDoF);
 
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfBetheHeitlerEffects.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfBetheHeitlerEffects.cxx
index 65cbd6386a1f0709c5d74f2c23e625c2156b5485..4770fb6d931e22d683ae6a957ae777eaa17badef 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfBetheHeitlerEffects.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfBetheHeitlerEffects.cxx
@@ -8,8 +8,8 @@
 begin                : Sunday 20th February 2005
 author               : atkinson
 email                : Tom.Atkinson@cern.ch
-decription           : Implementation code for the Bethe-Heitler material effects
-                       in the GSF package
+decription           : Implementation code for the Bethe-Heitler material
+effects in the GSF package
 *********************************************************************************/
 
 #include "TrkGaussianSumFilter/GsfBetheHeitlerEffects.h"
@@ -44,9 +44,12 @@ Trk::GsfBetheHeitlerEffects::GsfBetheHeitlerEffects(const std::string& type,
 {
 
   declareInterface<IMultiStateMaterialEffects>(this);
-  declareProperty("BetheHeitlerParameterisationFileName", m_parameterisationFileName);
-  declareProperty("BetheHeitlerParameterisationFileNameHighX0", m_parameterisationFileNameHighX0);
-  declareProperty("BetheHeitlerParameterisationCorrectionFlag", m_correctionFlag);
+  declareProperty("BetheHeitlerParameterisationFileName",
+                  m_parameterisationFileName);
+  declareProperty("BetheHeitlerParameterisationFileNameHighX0",
+                  m_parameterisationFileNameHighX0);
+  declareProperty("BetheHeitlerParameterisationCorrectionFlag",
+                  m_correctionFlag);
   declareProperty("SingleGaussianRange", m_singleGaussianRange = 0.0001);
   declareProperty("LowerRange", m_lowerRange = 0.002);
   declareProperty("XoverRange", m_xOverRange = 0.10);
@@ -59,14 +62,15 @@ StatusCode
 Trk::GsfBetheHeitlerEffects::initialize()
 {
 
-  if (m_correctionFlag == 1)
+  if (m_correctionFlag == 1) {
     ATH_MSG_INFO("1st moment of mixture will be corrected");
-  else if (m_correctionFlag == 2)
+  } else if (m_correctionFlag == 2) {
     ATH_MSG_INFO("1st and 2nd moment of mixture will be corrected");
-  else if (m_correctionFlag == 0)
+  } else if (m_correctionFlag == 0) {
     ATH_MSG_INFO("Moments of mixture will not be corrected");
-  else {
-    ATH_MSG_INFO("Inappropriate setting for Bethe-Heitler mixture correction! ...Exiting!");
+  } else {
+    ATH_MSG_INFO("Inappropriate setting for Bethe-Heitler mixture correction! "
+                 "...Exiting!");
     return StatusCode::FAILURE;
   }
 
@@ -74,13 +78,10 @@ Trk::GsfBetheHeitlerEffects::initialize()
     ATH_MSG_INFO("Parameters successfully imported from file");
     ATH_MSG_INFO("Initialisation of " << name() << " was successful");
     return StatusCode::SUCCESS;
-
   }
 
-  else {
-    ATH_MSG_ERROR("Parameters could NOT be successfully imported from file");
-    return StatusCode::FAILURE;
-  }
+  ATH_MSG_ERROR("Parameters could NOT be successfully imported from file");
+  return StatusCode::FAILURE;
 }
 
 StatusCode
@@ -94,10 +95,11 @@ Trk::GsfBetheHeitlerEffects::finalize()
 bool
 Trk::GsfBetheHeitlerEffects::readParameters()
 {
-  std::string resolvedFileName = PathResolver::find_file(m_parameterisationFileName, "DATAPATH");
-  if (!resolvedFileName.empty())
+  std::string resolvedFileName =
+    PathResolver::find_file(m_parameterisationFileName, "DATAPATH");
+  if (!resolvedFileName.empty()) {
     ATH_MSG_INFO("Parameterisation file found: " << resolvedFileName);
-  else {
+  } else {
     ATH_MSG_ERROR("Parameterisation file not found");
     return false;
   }
@@ -115,15 +117,18 @@ Trk::GsfBetheHeitlerEffects::readParameters()
   fin >> m_transformationCode;
   //
   if (not inRange(m_numberOfComponents, 0, 100)) {
-    ATH_MSG_ERROR("numberOfComponents Parameter out of range 0-100: " << m_numberOfComponents);
+    ATH_MSG_ERROR("numberOfComponents Parameter out of range 0-100: "
+                  << m_numberOfComponents);
     return false;
   }
   if (not inRange(orderPolynomial, 0, 10)) {
-    ATH_MSG_ERROR("orderPolynomial Parameter out of range 0-10: " << orderPolynomial);
+    ATH_MSG_ERROR(
+      "orderPolynomial Parameter out of range 0-10: " << orderPolynomial);
     return false;
   }
   if (not inRange(m_transformationCode, 0, 10)) {
-    ATH_MSG_ERROR("transformationCode Parameter out of range 0-10: " << m_transformationCode);
+    ATH_MSG_ERROR("transformationCode Parameter out of range 0-10: "
+                  << m_transformationCode);
     return false;
   }
   if (!fin) {
@@ -139,10 +144,11 @@ Trk::GsfBetheHeitlerEffects::readParameters()
   }
 
   if (m_useHighX0) {
-    resolvedFileName = PathResolver::find_file(m_parameterisationFileNameHighX0, "DATAPATH");
-    if (!resolvedFileName.empty())
+    resolvedFileName =
+      PathResolver::find_file(m_parameterisationFileNameHighX0, "DATAPATH");
+    if (!resolvedFileName.empty()) {
       ATH_MSG_INFO("Parameterisation file found: " << resolvedFileName);
-    else {
+    } else {
       ATH_MSG_ERROR("Parameterisation file not found");
       return false;
     }
@@ -161,15 +167,18 @@ Trk::GsfBetheHeitlerEffects::readParameters()
     fin >> m_transformationCodeHighX0;
     //
     if (not inRange(m_numberOfComponentsHighX0, 0, 100)) {
-      ATH_MSG_ERROR("numberOfComponents Parameter out of range 0-100: " << m_numberOfComponentsHighX0);
+      ATH_MSG_ERROR("numberOfComponents Parameter out of range 0-100: "
+                    << m_numberOfComponentsHighX0);
       return false;
     }
     if (not inRange(orderPolynomial, 0, 10)) {
-      ATH_MSG_ERROR("orderPolynomial Parameter out of range 0-10: " << orderPolynomial);
+      ATH_MSG_ERROR(
+        "orderPolynomial Parameter out of range 0-10: " << orderPolynomial);
       return false;
     }
     if (not inRange(m_transformationCodeHighX0, 0, 10)) {
-      ATH_MSG_ERROR("transformationCode Parameter out of range 0-10: " << m_transformationCodeHighX0);
+      ATH_MSG_ERROR("transformationCode Parameter out of range 0-10: "
+                    << m_transformationCodeHighX0);
       return false;
     }
     if (fin.bad()) {
@@ -181,7 +190,8 @@ Trk::GsfBetheHeitlerEffects::readParameters()
     for (; componentIndex < m_numberOfComponentsHighX0; ++componentIndex) {
       m_polynomialWeightsHighX0.push_back(readPolynomial(fin, orderPolynomial));
       m_polynomialMeansHighX0.push_back(readPolynomial(fin, orderPolynomial));
-      m_polynomialVariancesHighX0.push_back(readPolynomial(fin, orderPolynomial));
+      m_polynomialVariancesHighX0.push_back(
+        readPolynomial(fin, orderPolynomial));
     }
   }
   return true;
@@ -197,7 +207,8 @@ Trk::GsfBetheHeitlerEffects::readPolynomial(std::ifstream& fin, const int order)
 
   for (; orderIndex < (order + 1); ++orderIndex) {
     if (!fin) {
-      throw std::runtime_error("Reached end of stream but still expecting data.");
+      throw std::runtime_error(
+        "Reached end of stream but still expecting data.");
     }
     fin >> coefficients[orderIndex];
   }
@@ -206,12 +217,13 @@ Trk::GsfBetheHeitlerEffects::readPolynomial(std::ifstream& fin, const int order)
 }
 
 void
-Trk::GsfBetheHeitlerEffects::compute(Cache& cache,
-                                     const Trk::ComponentParameters& componentParameters,
-                                     const Trk::MaterialProperties& materialProperties,
-                                     double pathLength,
-                                     Trk::PropDirection direction,
-                                     Trk::ParticleHypothesis) const
+Trk::GsfBetheHeitlerEffects::compute(
+  Cache& cache,
+  const Trk::ComponentParameters& componentParameters,
+  const Trk::MaterialProperties& materialProperties,
+  double pathLength,
+  Trk::PropDirection direction,
+  Trk::ParticleHypothesis) const
 {
   // Clear cache
   cache.reset();
@@ -222,26 +234,28 @@ Trk::GsfBetheHeitlerEffects::compute(Cache& cache,
   double radiationLength = materialProperties.x0();
   double pathlengthInX0 = pathLength / radiationLength;
   double momentum = globalMomentum.mag();
-  
+
   // Produce a multi-component State
   if (pathlengthInX0 > m_singleGaussianRange) {
 
-    // If the amount of material is between 0.0001 and 0.01 return the gaussian approximation to the
-    // Bethe-Heitler distribution
+    // If the amount of material is between 0.0001 and 0.01 return the gaussian
+    // approximation to the Bethe-Heitler distribution
     if (pathlengthInX0 < m_lowerRange) {
 
-      ATH_MSG_DEBUG("Amount of material less than" << m_lowerRange << "... Parameterising Bethe-Heitler as Gaussian");
+      ATH_MSG_DEBUG("Amount of material less than"
+                    << m_lowerRange
+                    << "... Parameterising Bethe-Heitler as Gaussian");
 
       const double meanZ = exp(-1. * pathlengthInX0);
       const double sign = (direction == Trk::oppositeMomentum) ? 1. : -1.;
-      const double varZ = exp(-1. * pathlengthInX0 * log(3.) / log(2.)) - exp(-2. * pathlengthInX0);
+      const double varZ = exp(-1. * pathlengthInX0 * log(3.) / log(2.)) -
+                          exp(-2. * pathlengthInX0);
       double deltaP(0.);
       double varQoverP(0.);
-      if (direction == Trk::alongMomentum){
+      if (direction == Trk::alongMomentum) {
         deltaP = sign * momentum * (1. - meanZ);
         varQoverP = 1. / (meanZ * meanZ * momentum * momentum) * varZ;
-      }
-      else{
+      } else {
         deltaP = sign * momentum * (1. / meanZ - 1.);
         varQoverP = varZ / (momentum * momentum);
       }
@@ -252,20 +266,20 @@ Trk::GsfBetheHeitlerEffects::compute(Cache& cache,
       cache.deltaPs.push_back(deltaP);
       cache.weights.push_back(1.);
       cache.deltaCovariances.push_back(std::move(newCovarianceMatrix));
-      ATH_MSG_VERBOSE("Weight / deltaP / var (delta q/p) " << 1. << "\t" << deltaP << "\t" << varQoverP);
+      ATH_MSG_VERBOSE("Weight / deltaP / var (delta q/p) "
+                      << 1. << "\t" << deltaP << "\t" << varQoverP);
       return;
     }
 
-    if (pathlengthInX0 > m_upperRange){
+    if (pathlengthInX0 > m_upperRange) {
       pathlengthInX0 = m_upperRange;
     }
 
     MixtureParameters mixture;
     mixture.reserve(m_numberOfComponents);
-    if (m_useHighX0 && pathlengthInX0 > m_xOverRange){
+    if (m_useHighX0 && pathlengthInX0 > m_xOverRange) {
       getMixtureParametersHighX0(pathlengthInX0, mixture);
-    }
-    else{
+    } else {
       getMixtureParameters(pathlengthInX0, mixture);
     }
     correctWeights(mixture);
@@ -283,10 +297,11 @@ Trk::GsfBetheHeitlerEffects::compute(Cache& cache,
     int componentWithHighestMean(0);
 
     for (; componentIndex < m_numberOfComponents; ++componentIndex) {
-      if (mixture[componentIndex].mean > mixture[componentWithHighestMean].mean){
+      if (mixture[componentIndex].mean >
+          mixture[componentWithHighestMean].mean) {
         componentWithHighestMean = componentIndex;
       }
-      if (mixture[componentIndex].mean >= m_componentMeanCut){
+      if (mixture[componentIndex].mean >= m_componentMeanCut) {
         continue;
       }
       weightToBeRemoved += mixture[componentIndex].weight;
@@ -295,13 +310,13 @@ Trk::GsfBetheHeitlerEffects::compute(Cache& cache,
     for (; componentIndex < m_numberOfComponents; ++componentIndex) {
       double varianceInverseMomentum;
       // This is not mathematically correct but it does stabilize the GSF
-      if (mixture[componentIndex].mean < m_componentMeanCut){
+      if (mixture[componentIndex].mean < m_componentMeanCut) {
         continue;
       }
-      if (componentIndex == componentWithHighestMean){
-        cache.weights.push_back(mixture[componentIndex].weight + weightToBeRemoved);
-      }
-      else{
+      if (componentIndex == componentWithHighestMean) {
+        cache.weights.push_back(mixture[componentIndex].weight +
+                                weightToBeRemoved);
+      } else {
         cache.weights.push_back(mixture[componentIndex].weight);
       }
 
@@ -317,7 +332,8 @@ Trk::GsfBetheHeitlerEffects::compute(Cache& cache,
         // For backwards propagation
         deltaP = momentum * (1. / mixture[componentIndex].mean - 1.);
         cache.deltaPs.push_back(deltaP);
-        varianceInverseMomentum = mixture[componentIndex].variance / (momentum * momentum);
+        varianceInverseMomentum =
+          mixture[componentIndex].variance / (momentum * momentum);
       } // end backwards propagation if clause
 
       AmgSymMatrix(5) newCovarianceMatrix;
@@ -330,7 +346,9 @@ Trk::GsfBetheHeitlerEffects::compute(Cache& cache,
   } // end material limiting if clause
 
   else {
-    ATH_MSG_DEBUG("Trying to apply energy loss to " << pathlengthInX0 << " x/x0. No Bethe-Heitler effects applied");
+    ATH_MSG_DEBUG("Trying to apply energy loss to "
+                  << pathlengthInX0
+                  << " x/x0. No Bethe-Heitler effects applied");
     cache.weights.push_back(1.);
     cache.deltaPs.push_back(0.);
     AmgSymMatrix(5) newCovarianceMatrix;
@@ -340,85 +358,94 @@ Trk::GsfBetheHeitlerEffects::compute(Cache& cache,
 }
 
 void
-Trk::GsfBetheHeitlerEffects::getMixtureParameters(const double pathlengthInX0,
-                                                  Trk::GsfBetheHeitlerEffects::MixtureParameters& mixture) const
+Trk::GsfBetheHeitlerEffects::getMixtureParameters(
+  const double pathlengthInX0,
+  Trk::GsfBetheHeitlerEffects::MixtureParameters& mixture) const
 {
 
   int componentIndex = 0;
   for (; componentIndex < m_numberOfComponents; ++componentIndex) {
     double updatedWeight = m_polynomialWeights[componentIndex](pathlengthInX0);
     double updatedMean = m_polynomialMeans[componentIndex](pathlengthInX0);
-    double updatedVariance = m_polynomialVariances[componentIndex](pathlengthInX0);
-    if (m_transformationCode){
+    double updatedVariance =
+      m_polynomialVariances[componentIndex](pathlengthInX0);
+    if (m_transformationCode) {
       updatedWeight = logisticFunction(updatedWeight);
       updatedMean = logisticFunction(updatedMean);
       updatedVariance = exp(updatedVariance);
-    }
-    else{
+    } else {
       updatedVariance = updatedVariance * updatedVariance;
     }
-    mixture.emplace_back(updatedWeight,updatedMean,updatedVariance);
+    mixture.emplace_back(updatedWeight, updatedMean, updatedVariance);
   }
 }
 
 void
-Trk::GsfBetheHeitlerEffects::getMixtureParametersHighX0(const double pathlengthInX0,
-                                                        Trk::GsfBetheHeitlerEffects::MixtureParameters& mixture) const
+Trk::GsfBetheHeitlerEffects::getMixtureParametersHighX0(
+  const double pathlengthInX0,
+  Trk::GsfBetheHeitlerEffects::MixtureParameters& mixture) const
 {
 
   int componentIndex = 0;
   for (; componentIndex < m_numberOfComponentsHighX0; ++componentIndex) {
-    double updatedWeight = m_polynomialWeightsHighX0[componentIndex](pathlengthInX0);
-    double updatedMean = m_polynomialMeansHighX0[componentIndex](pathlengthInX0);
-    double updatedVariance = m_polynomialVariancesHighX0[componentIndex](pathlengthInX0);
-    if (m_transformationCodeHighX0){
+    double updatedWeight =
+      m_polynomialWeightsHighX0[componentIndex](pathlengthInX0);
+    double updatedMean =
+      m_polynomialMeansHighX0[componentIndex](pathlengthInX0);
+    double updatedVariance =
+      m_polynomialVariancesHighX0[componentIndex](pathlengthInX0);
+    if (m_transformationCodeHighX0) {
       updatedWeight = logisticFunction(updatedWeight);
       updatedMean = logisticFunction(updatedMean);
       updatedVariance = exp(updatedVariance);
-    }
-    else{
+    } else {
       updatedVariance = updatedVariance * updatedVariance;
     }
-    mixture.emplace_back(updatedWeight,updatedMean,updatedVariance);
+    mixture.emplace_back(updatedWeight, updatedMean, updatedVariance);
   }
 }
 
 void
-Trk::GsfBetheHeitlerEffects::correctWeights(Trk::GsfBetheHeitlerEffects::MixtureParameters& mixture) const
+Trk::GsfBetheHeitlerEffects::correctWeights(
+  Trk::GsfBetheHeitlerEffects::MixtureParameters& mixture) const
 {
 
-  if (mixture.empty()){
+  if (mixture.empty()) {
     return;
   }
 
   // Obtain the sum of weights
   double weightSum(0.);
 
-  Trk::GsfBetheHeitlerEffects::MixtureParameters::const_iterator component = mixture.begin();
-  for (; component != mixture.end(); ++component){
+  Trk::GsfBetheHeitlerEffects::MixtureParameters::const_iterator component =
+    mixture.begin();
+  for (; component != mixture.end(); ++component) {
     weightSum += (*component).weight;
   }
 
   // Rescale so that total weighting is 1
-  Trk::GsfBetheHeitlerEffects::MixtureParameters::iterator modifiableComponent = mixture.begin();
+  Trk::GsfBetheHeitlerEffects::MixtureParameters::iterator modifiableComponent =
+    mixture.begin();
 
-  for (; modifiableComponent != mixture.end(); ++modifiableComponent){
+  for (; modifiableComponent != mixture.end(); ++modifiableComponent) {
     (*modifiableComponent).weight /= weightSum;
   }
 }
 
 double
-Trk::GsfBetheHeitlerEffects::correctedFirstMean(const double pathlengthInX0,
-                                                const Trk::GsfBetheHeitlerEffects::MixtureParameters& mixture) const
+Trk::GsfBetheHeitlerEffects::correctedFirstMean(
+  const double pathlengthInX0,
+  const Trk::GsfBetheHeitlerEffects::MixtureParameters& mixture) const
 {
 
-  if (mixture.empty()){
+  if (mixture.empty()) {
     return 0.;
   }
   // Obtain the difference between the true and weighted sum
   double meanBH = betheHeitlerMean(pathlengthInX0);
-  Trk::GsfBetheHeitlerEffects::MixtureParameters::const_iterator component = mixture.begin() + 1;
-  for (; component != mixture.end(); ++component){
+  Trk::GsfBetheHeitlerEffects::MixtureParameters::const_iterator component =
+    mixture.begin() + 1;
+  for (; component != mixture.end(); ++component) {
     meanBH -= (*component).weight * (*component).mean;
   }
   // return the corrected mean for the first component
@@ -426,22 +453,26 @@ Trk::GsfBetheHeitlerEffects::correctedFirstMean(const double pathlengthInX0,
 }
 
 double
-Trk::GsfBetheHeitlerEffects::correctedFirstVariance(const double pathlengthInX0,
-                                                    const Trk::GsfBetheHeitlerEffects::MixtureParameters& mixture) const
+Trk::GsfBetheHeitlerEffects::correctedFirstVariance(
+  const double pathlengthInX0,
+  const Trk::GsfBetheHeitlerEffects::MixtureParameters& mixture) const
 {
 
-  if (mixture.empty()){
+  if (mixture.empty()) {
     return 0.;
   }
 
   // Obtain the difference between the true and weighed sum variances
   double varianceBH =
-    betheHeitlerVariance(pathlengthInX0) + (betheHeitlerMean(pathlengthInX0) * betheHeitlerMean(pathlengthInX0));
+    betheHeitlerVariance(pathlengthInX0) +
+    (betheHeitlerMean(pathlengthInX0) * betheHeitlerMean(pathlengthInX0));
   varianceBH -= mixture[0].weight * mixture[0].mean * mixture[0].mean;
 
-  Trk::GsfBetheHeitlerEffects::MixtureParameters::const_iterator component = mixture.begin() + 1;
-  for (; component != mixture.end(); ++component){
-    varianceBH -= (*component).weight * ((*component).mean * (*component).mean + (*component).variance);
+  Trk::GsfBetheHeitlerEffects::MixtureParameters::const_iterator component =
+    mixture.begin() + 1;
+  for (; component != mixture.end(); ++component) {
+    varianceBH -= (*component).weight * ((*component).mean * (*component).mean +
+                                         (*component).variance);
   }
   return std::max(varianceBH / mixture[0].weight, 0.);
 }
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfCombinedMaterialEffects.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfCombinedMaterialEffects.cxx
index 55bb5aaa72c9f1805cba3e05b33503a651779692..c5b2735ab7536d41f3b4db68959c1bbb94b2ade6 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfCombinedMaterialEffects.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfCombinedMaterialEffects.cxx
@@ -13,19 +13,20 @@ decription           : Implementation code for GsfCombinedMaterialEffects class
 #include "TrkGaussianSumFilter/GsfCombinedMaterialEffects.h"
 
 #include "GaudiKernel/ToolHandle.h"
-#include "TrkSurfaces/Surface.h"
+#include "TrkEventPrimitives/ParamDefs.h"
 #include "TrkGeometry/Layer.h"
-#include "TrkParameters/TrackParameters.h"
 #include "TrkMaterialOnTrack/EnergyLoss.h"
-#include "TrkEventPrimitives/ParamDefs.h"
+#include "TrkParameters/TrackParameters.h"
+#include "TrkSurfaces/Surface.h"
 
 namespace {
 const Trk::ParticleMasses s_particleMasses{};
 }
 
-Trk::GsfCombinedMaterialEffects::GsfCombinedMaterialEffects(const std::string& type,
-                                                            const std::string& name,
-                                                            const IInterface* parent)
+Trk::GsfCombinedMaterialEffects::GsfCombinedMaterialEffects(
+  const std::string& type,
+  const std::string& name,
+  const IInterface* parent)
   : AthAlgTool(type, name, parent)
 {
   declareInterface<IMultiStateMaterialEffects>(this);
@@ -36,11 +37,13 @@ Trk::GsfCombinedMaterialEffects::~GsfCombinedMaterialEffects() = default;
 StatusCode
 Trk::GsfCombinedMaterialEffects::initialize()
 {
-  // Retrieve and configure multiple scattering effects for multi-state operation
+  // Retrieve and configure multiple scattering effects for multi-state
+  // operation
   ATH_MSG_INFO("Configuring for multiple scattering");
   ATH_CHECK(m_msUpdator.retrieve());
 
-  // Retrieve and configure the std energy loss effects for multi-state operation
+  // Retrieve and configure the std energy loss effects for multi-state
+  // operation
   ATH_MSG_INFO("Configuring for normal energy loss");
   ATH_CHECK(m_EnergyLossUpdator.retrieve());
 
@@ -104,10 +107,18 @@ Trk::GsfCombinedMaterialEffects::compute(
 
   IMultiStateMaterialEffects::Cache cache_energyLoss;
   if (particleHypothesis == electron) {
-    m_betheHeitlerEffects->compute(cache_energyLoss, componentParameters, materialProperties, pathLength, direction);
+    m_betheHeitlerEffects->compute(cache_energyLoss,
+                                   componentParameters,
+                                   materialProperties,
+                                   pathLength,
+                                   direction);
   } else if (particleHypothesis != nonInteracting) {
-    this->energyLoss(
-      cache_energyLoss, componentParameters, materialProperties, pathLength, direction, particleHypothesis);
+    this->energyLoss(cache_energyLoss,
+                     componentParameters,
+                     materialProperties,
+                     pathLength,
+                     direction,
+                     particleHypothesis);
   }
 
   // Protect if there are no new components
@@ -126,7 +137,8 @@ Trk::GsfCombinedMaterialEffects::compute(
   // Iterators over the multiple scattering components
   auto multipleScatter_weightsIterator = cache_multipleScatter.weights.begin();
   auto multipleScatter_deltaPsIterator = cache_multipleScatter.deltaPs.begin();
-  auto multipleScatter_deltaCovariancesIterator = cache_multipleScatter.deltaCovariances.begin();
+  auto multipleScatter_deltaCovariancesIterator =
+    cache_multipleScatter.deltaCovariances.begin();
 
   // Loop over multiple scattering components
   for (; multipleScatter_weightsIterator != cache_multipleScatter.weights.end();
@@ -137,22 +149,28 @@ Trk::GsfCombinedMaterialEffects::compute(
     // Iterators over the energy loss components
     auto energyLoss_weightsIterator = cache_energyLoss.weights.begin();
     auto energyLoss_deltaPsIterator = cache_energyLoss.deltaPs.begin();
-    auto energyLoss_deltaCovariancesIterator = cache_energyLoss.deltaCovariances.begin();
+    auto energyLoss_deltaCovariancesIterator =
+      cache_energyLoss.deltaCovariances.begin();
 
     // Loop over energy loss components
 
     for (; energyLoss_weightsIterator != cache_energyLoss.weights.end();
-         ++energyLoss_weightsIterator, ++energyLoss_deltaPsIterator, ++energyLoss_deltaCovariancesIterator) {
+         ++energyLoss_weightsIterator,
+         ++energyLoss_deltaPsIterator,
+         ++energyLoss_deltaCovariancesIterator) {
 
-      double combinedWeight = (*multipleScatter_weightsIterator) * (*energyLoss_weightsIterator);
-      double combinedDeltaP = (*multipleScatter_deltaPsIterator) + (*energyLoss_deltaPsIterator);
+      double combinedWeight =
+        (*multipleScatter_weightsIterator) * (*energyLoss_weightsIterator);
+      double combinedDeltaP =
+        (*multipleScatter_deltaPsIterator) + (*energyLoss_deltaPsIterator);
 
       cache.weights.push_back(combinedWeight);
       cache.deltaPs.push_back(combinedDeltaP);
 
       if (measuredCov) {
         AmgSymMatrix(5) summedCovariance =
-          (*multipleScatter_deltaCovariancesIterator) + (*energyLoss_deltaCovariancesIterator);
+          (*multipleScatter_deltaCovariancesIterator) +
+          (*energyLoss_deltaCovariancesIterator);
         cache.deltaCovariances.push_back(std::move(summedCovariance));
       }
     } // end for loop over energy loss components
@@ -171,13 +189,14 @@ Trk::GsfCombinedMaterialEffects::scattering(
 {
   // Reset the cache
   cache.reset();
-  
+
   // Request track parameters from component parameters
   const Trk::TrackParameters* trackParameters = componentParameters.first.get();
   const AmgSymMatrix(5)* measuredTrackCov = trackParameters->covariance();
 
   if (!measuredTrackCov) {
-    ATH_MSG_DEBUG("No measurement associated with track parameters... returning original parameters");
+    ATH_MSG_DEBUG("No measurement associated with track parameters... "
+                  "returning original parameters");
     return;
   }
 
@@ -185,13 +204,17 @@ Trk::GsfCombinedMaterialEffects::scattering(
   double p = globalMomentum.mag();
 
   double pathcorrection = 1.;
-  if (materialProperties.thickness() != 0)
+  if (materialProperties.thickness() != 0) {
     pathcorrection = pathLength / materialProperties.thickness();
+  }
 
-  // Here we know the path length to be meff.thicknessX0, so we set pathcorrection = 1
-  // and create a dummy materialProperties with the properties we are interested in
-  MaterialProperties mprop(materialProperties.thicknessInX0(), 1., 0., 0., 0., 0.);
-  const double angularVariation = m_msUpdator->sigmaSquare(mprop, p, pathcorrection, Trk::muon);
+  // Here we know the path length to be meff.thicknessX0, so we set
+  // pathcorrection = 1 and create a dummy materialProperties with the
+  // properties we are interested in
+  MaterialProperties mprop(
+    materialProperties.thicknessInX0(), 1., 0., 0., 0., 0.);
+  const double angularVariation =
+    m_msUpdator->sigmaSquare(mprop, p, pathcorrection, Trk::muon);
 
   AmgSymMatrix(5) deltaCov;
   deltaCov.setZero();
@@ -220,14 +243,19 @@ Trk::GsfCombinedMaterialEffects::energyLoss(
   const Trk::TrackParameters* trackParameters = componentParameters.first.get();
   const AmgSymMatrix(5)* measuredCov = trackParameters->covariance();
   if (!measuredCov) {
-    ATH_MSG_DEBUG("No measurement on track parameters... returning original track parameters");
+    ATH_MSG_DEBUG("No measurement on track parameters... returning original "
+                  "track parameters");
     return;
   }
   double pathcorrection = pathLength / materialProperties.thickness();
   const Amg::Vector3D& globalMomentum = trackParameters->momentum();
 
-  EnergyLoss* energyLoss = m_EnergyLossUpdator->energyLoss(
-    materialProperties, globalMomentum.mag(), pathcorrection, direction, particleHypothesis, true);
+  EnergyLoss* energyLoss = m_EnergyLossUpdator->energyLoss(materialProperties,
+                                                           globalMomentum.mag(),
+                                                           pathcorrection,
+                                                           direction,
+                                                           particleHypothesis,
+                                                           true);
 
   // update for mean energy loss
   const double deltaE = energyLoss ? energyLoss->deltaE() : 0;
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfExtrapolator.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfExtrapolator.cxx
index b154379b17fc042f5c87ef0a38a7778df58bc673..80513e339cb2ab7739e1472944e4f88d9934fe4e 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfExtrapolator.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfExtrapolator.cxx
@@ -13,13 +13,13 @@ decription           : Implementation code for GsfExtrapolator class
 
 #include "TrkGaussianSumFilter/GsfExtrapolator.h"
 
-#include "TrkGaussianSumFilter/IMaterialMixtureConvolution.h"
 #include "TrkExInterfaces/IMultipleScatteringUpdator.h"
+#include "TrkGaussianSumFilter/IMaterialMixtureConvolution.h"
 
 #include "TrkGeometry/Layer.h"
+#include "TrkGeometry/MagneticFieldProperties.h"
 #include "TrkGeometry/MaterialProperties.h"
 #include "TrkGeometry/TrackingVolume.h"
-#include "TrkGeometry/MagneticFieldProperties.h"
 
 #include "TrkExUtils/MaterialUpdateMode.h"
 
@@ -38,7 +38,9 @@ namespace {
 const bool useBoundaryMaterialUpdate(true);
 }
 
-Trk::GsfExtrapolator::GsfExtrapolator(const std::string& type, const std::string& name, const IInterface* parent)
+Trk::GsfExtrapolator::GsfExtrapolator(const std::string& type,
+                                      const std::string& name,
+                                      const IInterface* parent)
   : AthAlgTool(type, name, parent)
   , m_propagatorStickyConfiguration(true)
   , m_surfaceBasedMaterialEffects(false)
@@ -72,7 +74,7 @@ Trk::GsfExtrapolator::initialize()
 {
 
   // Request the Propagator AlgTools
-  unsigned int retrievedPropagators=0;
+  unsigned int retrievedPropagators = 0;
   if (!m_propagators.empty()) {
     ATH_CHECK(m_propagators.retrieve());
     ATH_MSG_INFO("Retrieved tools " << m_propagators);
@@ -86,35 +88,44 @@ Trk::GsfExtrapolator::initialize()
     return StatusCode::FAILURE;
   }
 
-    ATH_MSG_INFO("Propagator configuration level: " << m_propagatorConfigurationLevel);
+  ATH_MSG_INFO(
+    "Propagator configuration level: " << m_propagatorConfigurationLevel);
 
-    // Request the Navigation AlgTool
-    ATH_CHECK(m_navigator.retrieve());
+  // Request the Navigation AlgTool
+  ATH_CHECK(m_navigator.retrieve());
 
-    // Request the Material Effects Updator AlgTool
-    ATH_CHECK(m_materialUpdator.retrieve());
+  // Request the Material Effects Updator AlgTool
+  ATH_CHECK(m_materialUpdator.retrieve());
 
-    ATH_CHECK(m_elossupdators.retrieve());
+  ATH_CHECK(m_elossupdators.retrieve());
 
-    ATH_CHECK(m_msupdators.retrieve());
+  ATH_CHECK(m_msupdators.retrieve());
 
-    m_fieldProperties = m_fastField ? Trk::MagneticFieldProperties(Trk::FastField)
-                                    : Trk::MagneticFieldProperties(Trk::FullField);
+  m_fieldProperties = m_fastField
+                        ? Trk::MagneticFieldProperties(Trk::FastField)
+                        : Trk::MagneticFieldProperties(Trk::FullField);
 
-    ATH_MSG_INFO("Initialisation of " << name() << " was successful");
-    return StatusCode::SUCCESS;
+  ATH_MSG_INFO("Initialisation of " << name() << " was successful");
+  return StatusCode::SUCCESS;
 }
 
 StatusCode
 Trk::GsfExtrapolator::finalize()
 {
-  ATH_MSG_INFO("*** Extrapolator " << name() << " performance statistics ***********");
-  ATH_MSG_INFO(" * - Number of extrapolate() calls:                " << m_extrapolateCalls);
-  ATH_MSG_INFO(" * - Number of extrapolateDirectly() fallbacks:    " << m_extrapolateDirectlyFallbacks);
-  ATH_MSG_INFO(" * - Number of navigation distance check breaks:   " << m_navigationDistanceIncreaseBreaks);
-  ATH_MSG_INFO(" * - Number of volume boundary search failures:    " << m_missedVolumeBoundary);
-  ATH_MSG_INFO(" * - Number of tracking volume oscillation breaks: " << m_oscillationBreaks);
-  ATH_MSG_INFO("***********************************************************************************)");
+  ATH_MSG_INFO("*** Extrapolator " << name()
+                                   << " performance statistics ***********");
+  ATH_MSG_INFO(" * - Number of extrapolate() calls:                "
+               << m_extrapolateCalls);
+  ATH_MSG_INFO(" * - Number of extrapolateDirectly() fallbacks:    "
+               << m_extrapolateDirectlyFallbacks);
+  ATH_MSG_INFO(" * - Number of navigation distance check breaks:   "
+               << m_navigationDistanceIncreaseBreaks);
+  ATH_MSG_INFO(" * - Number of volume boundary search failures:    "
+               << m_missedVolumeBoundary);
+  ATH_MSG_INFO(" * - Number of tracking volume oscillation breaks: "
+               << m_oscillationBreaks);
+  ATH_MSG_INFO("***************************************************************"
+               "********************)");
   ATH_MSG_INFO("Finalisation of " << name() << " was successful");
   return StatusCode::SUCCESS;
 }
@@ -123,7 +134,8 @@ Trk::GsfExtrapolator::finalize()
  * This is the actual (non-direct) extrapolation method
  * The other one will end up calling this one passing the internal cache
  */
-Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateImpl(
+Trk::MultiComponentState
+Trk::GsfExtrapolator::extrapolateImpl(
   const EventContext& ctx,
   Cache& cache,
   const Trk::IPropagator& propagator,
@@ -135,8 +147,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateImpl(
 {
   auto buff_extrapolateCalls = m_extrapolateCalls.buffer();
 
-  // If the extrapolation is to be without material effects simply revert to the extrapolateDirectly
-  // method
+  // If the extrapolation is to be without material effects simply revert to the
+  // extrapolateDirectly method
   if (particleHypothesis == Trk::nonInteracting) {
     return extrapolateDirectlyImpl(ctx,
                                    propagator,
@@ -146,7 +158,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateImpl(
                                    boundaryCheck,
                                    particleHypothesis);
   }
-  // Surface based material effects (assumes all material is on active sensor elements)
+  // Surface based material effects (assumes all material is on active sensor
+  // elements)
   if (m_surfaceBasedMaterialEffects) {
     return extrapolateSurfaceBasedMaterialEffects(ctx,
                                                   propagator,
@@ -176,27 +189,31 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateImpl(
                        direction);
 
   // Bail to direct extrapolation if the direction cannot be determined
-  if (direction == Trk::anyDirection)
+  if (direction == Trk::anyDirection) {
     return extrapolateDirectlyImpl(ctx,
-                               propagator,
-                               multiComponentState,
-                               surface,
-                               direction,
-                               boundaryCheck,
-                               particleHypothesis);
+                                   propagator,
+                                   multiComponentState,
+                                   surface,
+                                   direction,
+                                   boundaryCheck,
+                                   particleHypothesis);
+  }
 
-  const Trk::TrackParameters* combinedState = multiComponentState.begin()->first.get();
+  const Trk::TrackParameters* combinedState =
+    multiComponentState.begin()->first.get();
 
   const Trk::MultiComponentState* currentState = &multiComponentState;
 
-  /* Define the initial distance between destination and current position. Destination should be
-     determined from either
+  /* Define the initial distance between destination and current position.
+     Destination should be determined from either
      - reference parameters (prefered if they exist) or
      - destination surface
      */
 
-  Amg::Vector3D globalSeparation = referenceParameters ? referenceParameters->position() - combinedState->position()
-                                                       : surface.globalReferencePoint() - combinedState->position();
+  Amg::Vector3D globalSeparation =
+    referenceParameters
+      ? referenceParameters->position() - combinedState->position()
+      : surface.globalReferencePoint() - combinedState->position();
   double initialDistance = globalSeparation.mag();
   // Clean up memory from combiner. It is no longer needed
   combinedState = nullptr;
@@ -218,12 +235,15 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateImpl(
   const Trk::TrackingVolume* previousVolume = nullptr;
   auto buff_missedVolumeBoundary = m_missedVolumeBoundary.buffer();
   auto buff_oscillationBreaks = m_oscillationBreaks.buffer();
-  auto buff_navigationDistanceIncreaseBreaks = m_navigationDistanceIncreaseBreaks.buffer();
+  auto buff_navigationDistanceIncreaseBreaks =
+    m_navigationDistanceIncreaseBreaks.buffer();
 
   while (currentVolume && currentVolume != destinationVolume && currentState) {
     // Configure propagator based on the current tracking volume
     currentPropagator =
-      m_propagatorStickyConfiguration ? &propagator : &(*m_propagators[this->propagatorType(*currentVolume)]);
+      m_propagatorStickyConfiguration
+        ? &propagator
+        : &(*m_propagators[this->propagatorType(*currentVolume)]);
 
     // Extrapolate to volume boundary
     extrapolateToVolumeBoundary(ctx,
@@ -235,11 +255,14 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateImpl(
                                 direction,
                                 particleHypothesis);
 
-    // New current state is the state extrapolated to the tracking volume boundary.
+    // New current state is the state extrapolated to the tracking volume
+    // boundary.
     currentState = cache.m_stateAtBoundarySurface.stateAtBoundary;
 
-    // The volume that the extrapolation is about to enter into is called the nextVolume
-    const Trk::TrackingVolume* nextVolume = cache.m_stateAtBoundarySurface.trackingVolume;
+    // The volume that the extrapolation is about to enter into is called the
+    // nextVolume
+    const Trk::TrackingVolume* nextVolume =
+      cache.m_stateAtBoundarySurface.trackingVolume;
 
     // Break the loop if the next tracking volume is the same as the current one
     if (!nextVolume || nextVolume == currentVolume) {
@@ -249,7 +272,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateImpl(
       break;
     }
 
-    // New reference parameters are the navigation parameters at the boundary surface
+    // New reference parameters are the navigation parameters at the boundary
+    // surface
     referenceParameters = cache.m_stateAtBoundarySurface.navigationParameters;
 
     // Break the lop if an oscillation is detected
@@ -264,12 +288,18 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateImpl(
       break;
     }
 
-    // Break the loop if the distance between the surface and the track parameters has increased
+    // Break the loop if the distance between the surface and the track
+    // parameters has increased
     combinedState = currentState->begin()->first.get();
 
     const TrackParameters* parametersAtDestination =
-      currentPropagator->propagateParameters(
-        ctx, *combinedState, surface, direction, false, m_fieldProperties, Trk::electron);
+      currentPropagator->propagateParameters(ctx,
+                                             *combinedState,
+                                             surface,
+                                             direction,
+                                             false,
+                                             m_fieldProperties,
+                                             Trk::electron);
     Amg::Vector3D newDestination;
     if (parametersAtDestination) {
       newDestination = parametersAtDestination->position();
@@ -279,24 +309,29 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateImpl(
       newDestination = surface.center();
     }
 
-    double revisedDistance = (referenceParameters->position() - newDestination).mag();
+    double revisedDistance =
+      (referenceParameters->position() - newDestination).mag();
 
     double distanceChange = fabs(revisedDistance - initialDistance);
 
     if (revisedDistance > initialDistance && distanceChange > 0.01) {
-      ATH_MSG_DEBUG("Navigation break. Initial separation: " << initialDistance
-                                                             << " Current Sepatation: " << revisedDistance);
-      ATH_MSG_DEBUG(".... Volume  " << nextVolume->volumeName() << " from " << currentVolume->volumeName());
+      ATH_MSG_DEBUG("Navigation break. Initial separation: "
+                    << initialDistance
+                    << " Current Sepatation: " << revisedDistance);
+      ATH_MSG_DEBUG(".... Volume  " << nextVolume->volumeName() << " from "
+                                    << currentVolume->volumeName());
       foundFinalBoundary = false;
       ++buff_navigationDistanceIncreaseBreaks;
       break;
     }
 
     combinedState = nullptr;
-    ATH_MSG_DEBUG("Switching tracking volume look for Material: " << nextVolume->volumeName());
+    ATH_MSG_DEBUG("Switching tracking volume look for Material: "
+                  << nextVolume->volumeName());
     // Initialise the oscillation checker
     previousVolume = currentVolume;
-    // As the extrapolation is moving into the next volume, the next volume -> current volume
+    // As the extrapolation is moving into the next volume, the next volume ->
+    // current volume
     currentVolume = nextVolume;
     // Associated layer now needs to be reset
     // if(!entryLayerFound)
@@ -305,27 +340,31 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateImpl(
 
   // Look to catch failures now
   if (!currentState) {
-    ATH_MSG_DEBUG("No current state at boundary... Falling back to original state");
+    ATH_MSG_DEBUG(
+      "No current state at boundary... Falling back to original state");
     currentState = &multiComponentState;
     foundFinalBoundary = false;
   }
 
   if (currentVolume != destinationVolume) {
-    ATH_MSG_DEBUG("Trk::GsfExtrapolator::extrapolate failed to reach destination volume... ");
+    ATH_MSG_DEBUG("Trk::GsfExtrapolator::extrapolate failed to reach "
+                  "destination volume... ");
     currentState = &multiComponentState;
     foundFinalBoundary = false;
   }
 
   if (!foundFinalBoundary) {
-    ATH_MSG_DEBUG("Could not find final boundary switch to direct EXTRAPOLATION");
-
-    Trk::MultiComponentState bailOutState = multiStatePropagate(ctx,
-                                                                propagator,
-                                                                *currentState,
-                                                                surface,
-                                                                Trk::anyDirection,
-                                                                boundaryCheck,
-                                                                particleHypothesis);
+    ATH_MSG_DEBUG(
+      "Could not find final boundary switch to direct EXTRAPOLATION");
+
+    Trk::MultiComponentState bailOutState =
+      multiStatePropagate(ctx,
+                          propagator,
+                          *currentState,
+                          surface,
+                          Trk::anyDirection,
+                          boundaryCheck,
+                          particleHypothesis);
 
     if (bailOutState.empty()) {
       ATH_MSG_DEBUG("Fallback to propagation failed... Returning 0");
@@ -341,34 +380,41 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateImpl(
 
   // Configure propagator based on the current tracking volume
   currentPropagator =
-    m_propagatorStickyConfiguration ? &propagator : &(*m_propagators[this->propagatorType(*currentVolume)]);
+    m_propagatorStickyConfiguration
+      ? &propagator
+      : &(*m_propagators[this->propagatorType(*currentVolume)]);
 
   // extrapolate inside destination volume
-  Trk::MultiComponentState destinationState = extrapolateInsideVolume(ctx,
-                                                                      cache,
-                                                                      *currentPropagator,
-                                                                      *currentState,
-                                                                      surface,
-                                                                      associatedLayer,
-                                                                      *currentVolume,
-                                                                      direction,
-                                                                      boundaryCheck,
-                                                                      particleHypothesis);
-
-  // FALLBACK POINT: Crisis if extrapolation fails here... As per extrapolation to volume boundary,
-  // in emergency revert to extrapolateDirectly
+  Trk::MultiComponentState destinationState =
+    extrapolateInsideVolume(ctx,
+                            cache,
+                            *currentPropagator,
+                            *currentState,
+                            surface,
+                            associatedLayer,
+                            *currentVolume,
+                            direction,
+                            boundaryCheck,
+                            particleHypothesis);
+
+  // FALLBACK POINT: Crisis if extrapolation fails here... As per extrapolation
+  // to volume boundary, in emergency revert to extrapolateDirectly
 
   // or we failed to reach the target
-  if (!destinationState.empty() && &((*(destinationState.begin())).first->associatedSurface()) != &surface) {
-    ATH_MSG_DEBUG("Failed to reach destination surface  ... reached some other surface");
+  if (!destinationState.empty() &&
+      &((*(destinationState.begin())).first->associatedSurface()) != &surface) {
+    ATH_MSG_DEBUG(
+      "Failed to reach destination surface  ... reached some other surface");
     destinationState.clear();
   }
 
   // Gaudi counter buffer
-  auto buff_extrapolateDirectlyFallbacks = m_extrapolateDirectlyFallbacks.buffer();
+  auto buff_extrapolateDirectlyFallbacks =
+    m_extrapolateDirectlyFallbacks.buffer();
 
   if (destinationState.empty()) {
-    ATH_MSG_DEBUG("extrapolateInsideVolume() failed... falling back to direct propagation");
+    ATH_MSG_DEBUG(
+      "extrapolateInsideVolume() failed... falling back to direct propagation");
     destinationState = multiStatePropagate(ctx,
                                            propagator,
                                            *currentState,
@@ -410,7 +456,6 @@ Trk::GsfExtrapolator::extrapolateDirectlyImpl(
                              particleHypothesis);
 }
 
-
 /************************************************************/
 /*
  * Done with the internal actual implementation methods here
@@ -421,7 +466,8 @@ Trk::GsfExtrapolator::extrapolateDirectlyImpl(
 /*
  * Extrapolate Interface
  */
-Trk::MultiComponentState Trk::GsfExtrapolator::extrapolate(
+Trk::MultiComponentState
+Trk::GsfExtrapolator::extrapolate(
   const EventContext& ctx,
   const Trk::MultiComponentState& multiComponentState,
   const Trk::Surface& surface,
@@ -436,7 +482,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolate(
   }
 
   // Set the propagator to that one corresponding to the configuration level
-  const Trk::IPropagator* currentPropagator = &(*m_propagators[m_propagatorConfigurationLevel]);
+  const Trk::IPropagator* currentPropagator =
+    &(*m_propagators[m_propagatorConfigurationLevel]);
   return extrapolateImpl(ctx,
                          cache,
                          *currentPropagator,
@@ -450,7 +497,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolate(
 /*
  * Extrapolate Directly method. Does not use a cache
  */
-Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateDirectly(
+Trk::MultiComponentState
+Trk::GsfExtrapolator::extrapolateDirectly(
   const EventContext& ctx,
   const Trk::MultiComponentState& multiComponentState,
   const Trk::Surface& surface,
@@ -463,14 +511,16 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateDirectly(
     return {};
   }
   // Set the propagator to that one corresponding to the configuration level
-  const Trk::IPropagator* currentPropagator = &(*m_propagators[m_propagatorConfigurationLevel]);
- 
+  const Trk::IPropagator* currentPropagator =
+    &(*m_propagators[m_propagatorConfigurationLevel]);
+
   auto buff_extrapolateDirectlyCalls = m_extrapolateDirectlyCalls.buffer();
   // statistics
   ++buff_extrapolateDirectlyCalls;
   const Trk::TrackingVolume* currentVolume = m_navigator->highestVolume();
   if (!currentVolume) {
-    ATH_MSG_WARNING("Current tracking volume could not be determined... returning 0");
+    ATH_MSG_WARNING(
+      "Current tracking volume could not be determined... returning 0");
     return {};
   }
   return extrapolateDirectlyImpl(ctx,
@@ -486,38 +536,41 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateDirectly(
  * Extrapolate M
  */
 std::unique_ptr<std::vector<const Trk::TrackStateOnSurface*>>
-Trk::GsfExtrapolator::extrapolateM(const EventContext& ctx,
-                                   const Trk::MultiComponentState& mcsparameters,
-                                   const Surface& sf,
-                                   PropDirection dir,
-                                   const BoundaryCheck& bcheck,
-                                   ParticleHypothesis particle) const
+Trk::GsfExtrapolator::extrapolateM(
+  const EventContext& ctx,
+  const Trk::MultiComponentState& mcsparameters,
+  const Surface& sf,
+  PropDirection dir,
+  const BoundaryCheck& bcheck,
+  ParticleHypothesis particle) const
 {
   // create a new vector for the material to be collected
 
-  //Look for current volume
+  // Look for current volume
   Cache cache{};
   cache.m_matstates.reset();
   // collect the material
 
- // Set the propagator to that one corresponding to the configuration level
- const Trk::IPropagator* currentPropagator = &(*m_propagators[m_propagatorConfigurationLevel]);
- MultiComponentState parameterAtDestination = extrapolateImpl(
-   ctx, cache, *currentPropagator, mcsparameters, sf, dir, bcheck, particle);
- // there are no parameters
- if (parameterAtDestination.empty()) {
-   // loop over and clean up
-   for (const Trk::TrackStateOnSurface* ptr : *cache.m_matstates) {
-     delete ptr;
-   }
-   emptyGarbageBins(cache);
-   return nullptr;
+  // Set the propagator to that one corresponding to the configuration level
+  const Trk::IPropagator* currentPropagator =
+    &(*m_propagators[m_propagatorConfigurationLevel]);
+  MultiComponentState parameterAtDestination = extrapolateImpl(
+    ctx, cache, *currentPropagator, mcsparameters, sf, dir, bcheck, particle);
+  // there are no parameters
+  if (parameterAtDestination.empty()) {
+    // loop over and clean up
+    for (const Trk::TrackStateOnSurface* ptr : *cache.m_matstates) {
+      delete ptr;
+    }
+    emptyGarbageBins(cache);
+    return nullptr;
   }
-  cache.m_matstates->push_back(
-    new TrackStateOnSurface(nullptr, parameterAtDestination.begin()->first->clone(), nullptr, nullptr));
+  cache.m_matstates->push_back(new TrackStateOnSurface(
+    nullptr, parameterAtDestination.begin()->first->clone(), nullptr, nullptr));
 
   // assign the temporary states
-  std::unique_ptr<std::vector<const Trk::TrackStateOnSurface*>> tmpMatStates = std::move(cache.m_matstates);
+  std::unique_ptr<std::vector<const Trk::TrackStateOnSurface*>> tmpMatStates =
+    std::move(cache.m_matstates);
   emptyGarbageBins(cache);
   // return the material states
   return tmpMatStates;
@@ -533,14 +586,15 @@ Trk::GsfExtrapolator::extrapolateM(const EventContext& ctx,
  *   Extrapolate to Volume Boundary!
  */
 void
-Trk::GsfExtrapolator::extrapolateToVolumeBoundary(const EventContext& ctx,
-                                                  Cache& cache,
-                                                  const Trk::IPropagator& propagator,
-                                                  const Trk::MultiComponentState& multiComponentState,
-                                                  const Trk::Layer* layer,
-                                                  const Trk::TrackingVolume& trackingVolume,
-                                                  Trk::PropDirection direction,
-                                                  Trk::ParticleHypothesis particleHypothesis) const
+Trk::GsfExtrapolator::extrapolateToVolumeBoundary(
+  const EventContext& ctx,
+  Cache& cache,
+  const Trk::IPropagator& propagator,
+  const Trk::MultiComponentState& multiComponentState,
+  const Trk::Layer* layer,
+  const Trk::TrackingVolume& trackingVolume,
+  Trk::PropDirection direction,
+  Trk::ParticleHypothesis particleHypothesis) const
 {
 
   // MultiComponentState propagation and material effects
@@ -549,31 +603,39 @@ Trk::GsfExtrapolator::extrapolateToVolumeBoundary(const EventContext& ctx,
   // Determine the current layer - the state combiner is required
 
   if (!currentState) {
-    ATH_MSG_WARNING("extrapolateToVolumeBoundary: Trying to extrapolate nothing?? -  return");
+    ATH_MSG_WARNING(
+      "extrapolateToVolumeBoundary: Trying to extrapolate nothing?? -  return");
     return;
   }
 
-  const Trk::TrackParameters* combinedState = currentState->begin()->first.get();
+  const Trk::TrackParameters* combinedState =
+    currentState->begin()->first.get();
   const Trk::Layer* associatedLayer = layer;
 
   if (!associatedLayer) {
     ATH_MSG_DEBUG("No associated layer passed with volume.... lets get one");
-    // Get entry layer but do not use it as  it should have already be hit if it was desired
+    // Get entry layer but do not use it as  it should have already be hit if it
+    // was desired
     associatedLayer = trackingVolume.associatedLayer(combinedState->position());
-    associatedLayer = associatedLayer ? associatedLayer
-                                      : trackingVolume.nextLayer(combinedState->position(),
-                                                                 direction * combinedState->momentum().unit(),
-                                                                 associatedLayer);
+    associatedLayer =
+      associatedLayer
+        ? associatedLayer
+        : trackingVolume.nextLayer(combinedState->position(),
+                                   direction * combinedState->momentum().unit(),
+                                   associatedLayer);
     ATH_MSG_DEBUG("Found layer in Volume " << layerRZoutput(associatedLayer));
   }
   // Only loop over layers if they can be found within the tracking volume
-  else if (trackingVolume.confinedLayers() && associatedLayer->layerMaterialProperties()) {
-    Trk::MultiComponentState updatedState =
-      m_materialUpdator->postUpdate(*currentState, *layer, direction, particleHypothesis);
+  else if (trackingVolume.confinedLayers() &&
+           associatedLayer->layerMaterialProperties()) {
+    Trk::MultiComponentState updatedState = m_materialUpdator->postUpdate(
+      *currentState, *layer, direction, particleHypothesis);
 
     if (!updatedState.empty()) {
       addMaterialtoVector(cache, layer, currentState->begin()->first.get());
-      currentState = std::make_unique<Trk::MultiComponentState>(std::move(updatedState)).release();
+      currentState =
+        std::make_unique<Trk::MultiComponentState>(std::move(updatedState))
+          .release();
     }
   }
 
@@ -581,8 +643,9 @@ Trk::GsfExtrapolator::extrapolateToVolumeBoundary(const EventContext& ctx,
   combinedState = nullptr;
 
   Trk::MultiComponentState nextState{};
-  // If an associated surface can be found, extrapolation within the tracking volume is mandatory
-  // This will take extrapolate to the last layer in the volume
+  // If an associated surface can be found, extrapolation within the tracking
+  // volume is mandatory This will take extrapolate to the last layer in the
+  // volume
   if (associatedLayer) {
     nextState = extrapolateFromLayerToLayer(ctx,
                                             cache,
@@ -595,12 +658,15 @@ Trk::GsfExtrapolator::extrapolateToVolumeBoundary(const EventContext& ctx,
                                             particleHypothesis);
     // if we have a next State update the currentState
     if (!nextState.empty()) {
-      // We can delete the currentState as long as it does not point to the input
+      // We can delete the currentState as long as it does not point to the
+      // input
       if (currentState != &multiComponentState) {
         delete currentState;
       }
       // currentState now owns the ptr
-      currentState = std::make_unique<Trk::MultiComponentState>(std::move(nextState)).release();
+      currentState =
+        std::make_unique<Trk::MultiComponentState>(std::move(nextState))
+          .release();
     }
   }
 
@@ -613,33 +679,38 @@ Trk::GsfExtrapolator::extrapolateToVolumeBoundary(const EventContext& ctx,
   combinedState = currentState->begin()->first->clone();
 
   const Trk::TrackingVolume* nextVolume = nullptr;
-  const Trk::TrackParameters* navigationParameters = cache.m_stateAtBoundarySurface.navigationParameters
-                                                       ? cache.m_stateAtBoundarySurface.navigationParameters
-                                                       : combinedState;
+  const Trk::TrackParameters* navigationParameters =
+    cache.m_stateAtBoundarySurface.navigationParameters
+      ? cache.m_stateAtBoundarySurface.navigationParameters
+      : combinedState;
 
   unsigned int navigationPropagatorIndex = 0;
 
   while (navigationPropagatorIndex <= m_propagatorConfigurationLevel) {
 
-    const Trk::IPropagator* navigationPropagator = &(*m_propagators[navigationPropagatorIndex]);
+    const Trk::IPropagator* navigationPropagator =
+      &(*m_propagators[navigationPropagatorIndex]);
 
     if (!navigationPropagator) {
-      ATH_MSG_WARNING("Navigation propagator cannot be retrieved... Continuing");
+      ATH_MSG_WARNING(
+        "Navigation propagator cannot be retrieved... Continuing");
       continue;
     }
 
     nextNavigationCell = m_navigator->nextTrackingVolume(
       *navigationPropagator, *navigationParameters, direction, trackingVolume);
     nextVolume = nextNavigationCell.nextVolume;
-    if (navigationPropagatorIndex >= 1)
+    if (navigationPropagatorIndex >= 1) {
       delete navigationParameters;
+    }
     navigationParameters = nextNavigationCell.parametersOnBoundary;
 
     ++navigationPropagatorIndex;
 
     // If the next tracking volume is found then no need to continue looping
-    if (nextVolume)
+    if (nextVolume) {
       break;
+    }
   }
   // Clean up memory allocated by the combiner
   if (navigationParameters != combinedState) {
@@ -647,7 +718,9 @@ Trk::GsfExtrapolator::extrapolateToVolumeBoundary(const EventContext& ctx,
   }
 
   if (!nextVolume) {
-    ATH_MSG_DEBUG("Cannot find next TrackingVolume from initial tracking volume: " << trackingVolume.volumeName());
+    ATH_MSG_DEBUG(
+      "Cannot find next TrackingVolume from initial tracking volume: "
+      << trackingVolume.volumeName());
     // Reset the layer recall
     resetRecallInformation(cache);
   }
@@ -661,9 +734,12 @@ Trk::GsfExtrapolator::extrapolateToVolumeBoundary(const EventContext& ctx,
     // If so, apply material effects update.
 
     // Get layer associated with boundary surface.
-    const Trk::TrackParameters* paramsAtBoundary = nextNavigationCell.parametersOnBoundary;
+    const Trk::TrackParameters* paramsAtBoundary =
+      nextNavigationCell.parametersOnBoundary;
     const Trk::Layer* layerAtBoundary =
-      (paramsAtBoundary) ? (paramsAtBoundary->associatedSurface()).materialLayer() : nullptr;
+      (paramsAtBoundary)
+        ? (paramsAtBoundary->associatedSurface()).materialLayer()
+        : nullptr;
     const Trk::TrackParameters* matUpdatedParameters = nullptr;
     Trk::MultiComponentState matUpdatedState{};
 
@@ -671,16 +747,20 @@ Trk::GsfExtrapolator::extrapolateToVolumeBoundary(const EventContext& ctx,
       if (layerAtBoundary->layerMaterialProperties()) {
         ATH_MSG_DEBUG("Boundary surface has material - updating properties");
         assert(currentState);
-        matUpdatedState = m_materialUpdator->postUpdate(*currentState, *layerAtBoundary, direction, particleHypothesis);
+        matUpdatedState = m_materialUpdator->postUpdate(
+          *currentState, *layerAtBoundary, direction, particleHypothesis);
       }
     }
 
-    // If state has changed due to boundary material, modify state, parameters accordingly.
+    // If state has changed due to boundary material, modify state, parameters
+    // accordingly.
     if (!matUpdatedState.empty()) {
       ATH_MSG_DEBUG("Performing state update");
       // Clean out memory, update state.
       delete currentState;
-      currentState = std::make_unique<Trk::MultiComponentState>(std::move(matUpdatedState)).release();
+      currentState =
+        std::make_unique<Trk::MultiComponentState>(std::move(matUpdatedState))
+          .release();
       // Update navigation parameters (?).
       matUpdatedParameters = currentState->begin()->first->clone();
       if (matUpdatedParameters != navigationParameters) {
@@ -688,12 +768,14 @@ Trk::GsfExtrapolator::extrapolateToVolumeBoundary(const EventContext& ctx,
         navigationParameters = matUpdatedParameters;
       }
       // Add to material vector.
-      addMaterialtoVector(cache, layerAtBoundary, currentState->begin()->first.get());
+      addMaterialtoVector(
+        cache, layerAtBoundary, currentState->begin()->first.get());
     }
   }
 
   // Update the boundary information in the cache
-  cache.m_stateAtBoundarySurface.updateBoundaryInformation(currentState, navigationParameters, nextVolume);
+  cache.m_stateAtBoundarySurface.updateBoundaryInformation(
+    currentState, navigationParameters, nextVolume);
 
   // Make sure navigation parameters
   // and currentstate (if is not the same as input)
@@ -708,7 +790,8 @@ Trk::GsfExtrapolator::extrapolateToVolumeBoundary(const EventContext& ctx,
  * Extrapolate inside volume to destination surface!
  */
 
-Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateInsideVolume(
+Trk::MultiComponentState
+Trk::GsfExtrapolator::extrapolateInsideVolume(
   const EventContext& ctx,
   Cache& cache,
   const Trk::IPropagator& propagator,
@@ -721,50 +804,59 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateInsideVolume(
   Trk::ParticleHypothesis particleHypothesis) const
 {
 
-  ATH_MSG_DEBUG("GSF extrapolateInsideVolume() in tracking volume: " << trackingVolume.volumeName());
+  ATH_MSG_DEBUG("GSF extrapolateInsideVolume() in tracking volume: "
+                << trackingVolume.volumeName());
 
   /*
    * We use current State to track where we are
    */
   const Trk::MultiComponentState* currentState = &multiComponentState;
 
-  //Retrieve the destination layer
+  // Retrieve the destination layer
   // 1. Association
   const Trk::Layer* destinationLayer = surface.associatedLayer();
 
   // 2. Recall and Global Search
   if (!destinationLayer) {
     ATH_MSG_DEBUG("No associated later to surface");
-    destinationLayer = (&surface == cache.m_recallSurface)
-                         ? cache.m_recallLayer
-                         : trackingVolume.associatedLayer(surface.globalReferencePoint());
+    destinationLayer =
+      (&surface == cache.m_recallSurface)
+        ? cache.m_recallLayer
+        : trackingVolume.associatedLayer(surface.globalReferencePoint());
   }
 
-  //Retrieve the current layer
+  // Retrieve the current layer
   // Produce a combined state
-  const Trk::TrackParameters* combinedState = currentState->begin()->first.get();
+  const Trk::TrackParameters* combinedState =
+    currentState->begin()->first.get();
 
   const Trk::Layer* associatedLayer = layer;
 
   Trk::MultiComponentState updatedState{};
   if (!associatedLayer) {
     ATH_MSG_DEBUG("No assoicated layer passed with volume.... lets get one");
-    // Get entry layer but do not use it as  it should have already be hit if it was desired
+    // Get entry layer but do not use it as  it should have already be hit if it
+    // was desired
     associatedLayer = trackingVolume.associatedLayer(combinedState->position());
-    associatedLayer = associatedLayer ? associatedLayer
-                                      : trackingVolume.nextLayer(combinedState->position(),
-                                                                 direction * combinedState->momentum().unit(),
-                                                                 associatedLayer);
+    associatedLayer =
+      associatedLayer
+        ? associatedLayer
+        : trackingVolume.nextLayer(combinedState->position(),
+                                   direction * combinedState->momentum().unit(),
+                                   associatedLayer);
     ATH_MSG_DEBUG("Found layer in Volume " << layerRZoutput(associatedLayer));
   }
 
-  else if (associatedLayer != destinationLayer && trackingVolume.confinedLayers() &&
+  else if (associatedLayer != destinationLayer &&
+           trackingVolume.confinedLayers() &&
            associatedLayer->layerMaterialProperties()) {
 
-    updatedState = m_materialUpdator->postUpdate(*currentState, *associatedLayer, direction, particleHypothesis);
+    updatedState = m_materialUpdator->postUpdate(
+      *currentState, *associatedLayer, direction, particleHypothesis);
 
     if (!updatedState.empty()) {
-      addMaterialtoVector(cache, associatedLayer, currentState->begin()->first.get());
+      addMaterialtoVector(
+        cache, associatedLayer, currentState->begin()->first.get());
       // Refresh the current state pointer
       currentState = &updatedState;
     }
@@ -774,7 +866,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateInsideVolume(
   combinedState = nullptr;
   Trk::MultiComponentState nextState{};
   if (destinationLayer) {
-    // If there are intermediate layers then additional extrapolations need to be done
+    // If there are intermediate layers then additional extrapolations need to
+    // be done
     if (associatedLayer && associatedLayer != destinationLayer) {
       nextState = extrapolateFromLayerToLayer(ctx,
                                               cache,
@@ -793,35 +886,40 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateInsideVolume(
       }
     }
     // Final extrapolation to destination surface
-    Trk::MultiComponentState returnState = extrapolateToDestinationLayer(ctx,
-                                                                         cache,
-                                                                         propagator,
-                                                                         *currentState,
-                                                                         surface,
-                                                                         *destinationLayer,
-                                                                         // trackingVolume,
-                                                                         associatedLayer,
-                                                                         direction,
-                                                                         boundaryCheck,
-                                                                         particleHypothesis);
+    Trk::MultiComponentState returnState =
+      extrapolateToDestinationLayer(ctx,
+                                    cache,
+                                    propagator,
+                                    *currentState,
+                                    surface,
+                                    *destinationLayer,
+                                    // trackingVolume,
+                                    associatedLayer,
+                                    direction,
+                                    boundaryCheck,
+                                    particleHypothesis);
     // Set the information for the current layer, surface, tracking volume
     setRecallInformation(cache, surface, *destinationLayer, trackingVolume);
     return returnState;
   }
 
-  // FALLBACK POINT: If no destination layer is found fall-back and extrapolate directly
-  ATH_MSG_DEBUG("extrapolateInsideVolume() could not find the destination layer... propagating "
+  // FALLBACK POINT: If no destination layer is found fall-back and extrapolate
+  // directly
+  ATH_MSG_DEBUG("extrapolateInsideVolume() could not find the destination "
+                "layer... propagating "
                 "directly to surface");
 
-  Trk::MultiComponentState returnState = multiStatePropagate(ctx,
-                                                             propagator,
-                                                             *currentState,
-                                                             surface,
-                                                             direction,
-                                                             boundaryCheck,
-                                                             particleHypothesis);
-
-  // No destination layer exists so layer recall method cannot be used and should be reset
+  Trk::MultiComponentState returnState =
+    multiStatePropagate(ctx,
+                        propagator,
+                        *currentState,
+                        surface,
+                        direction,
+                        boundaryCheck,
+                        particleHypothesis);
+
+  // No destination layer exists so layer recall method cannot be used and
+  // should be reset
   resetRecallInformation(cache);
 
   return returnState;
@@ -830,7 +928,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateInsideVolume(
 /*
  * Extrapolate from Layer to Layer
  */
-Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateFromLayerToLayer(
+Trk::MultiComponentState
+Trk::GsfExtrapolator::extrapolateFromLayerToLayer(
   const EventContext& ctx,
   Cache& cache,
   const IPropagator& propagator,
@@ -845,12 +944,14 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateFromLayerToLayer(
   const Trk::Layer* currentLayer = startLayer;
   Trk::MultiComponentState currentState{};
 
-  const Trk::TrackParameters* combinedState = multiComponentState.begin()->first.get();
+  const Trk::TrackParameters* combinedState =
+    multiComponentState.begin()->first.get();
   Amg::Vector3D currentPosition = combinedState->position();
   Amg::Vector3D currentDirection = direction * combinedState->momentum().unit();
 
   // No need to extrapolate to start layer, find the next one
-  const Trk::Layer* nextLayer = currentLayer->nextLayer(currentPosition, currentDirection);
+  const Trk::Layer* nextLayer =
+    currentLayer->nextLayer(currentPosition, currentDirection);
 
   std::set<const Trk::Layer*> layersHit;
   layersHit.insert(currentLayer);
@@ -858,8 +959,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateFromLayerToLayer(
   // Begin while loop over all intermediate layers
   while (nextLayer && nextLayer != destinationLayer) {
     layersHit.insert(nextLayer);
-    // Only extrapolate to an intermediate layer if it requires material update... otherwise step
-    // over it
+    // Only extrapolate to an intermediate layer if it requires material
+    // update... otherwise step over it
     if (nextLayer && nextLayer->layerMaterialProperties()) {
 
       if (!currentState.empty()) {
@@ -898,8 +999,10 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateFromLayerToLayer(
     }
   }
 
-  if (destinationLayer && nextLayer != destinationLayer && !currentState.empty()) {
-    ATH_MSG_DEBUG("extrapolateFromLayerToLayer failed to reach destination layer..  return nullptr");
+  if (destinationLayer && nextLayer != destinationLayer &&
+      !currentState.empty()) {
+    ATH_MSG_DEBUG("extrapolateFromLayerToLayer failed to reach destination "
+                  "layer..  return nullptr");
     ATH_MSG_DEBUG("Current layer     " << layerRZoutput(currentLayer));
     ATH_MSG_DEBUG("NextLayer layer   " << layerRZoutput(nextLayer));
     ATH_MSG_DEBUG("Destination layer " << layerRZoutput(destinationLayer));
@@ -913,7 +1016,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateFromLayerToLayer(
  * Extrapolate to Intermediate Layer
  */
 
-Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateToIntermediateLayer(
+Trk::MultiComponentState
+Trk::GsfExtrapolator::extrapolateToIntermediateLayer(
   const EventContext& ctx,
   Cache& cache,
   const Trk::IPropagator& propagator,
@@ -924,7 +1028,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateToIntermediateLayer(
   Trk::ParticleHypothesis particleHypothesis,
   bool doPerpCheck) const
 {
-  const Trk::Surface* startSurface = &(multiComponentState.begin()->first->associatedSurface());
+  const Trk::Surface* startSurface =
+    &(multiComponentState.begin()->first->associatedSurface());
   if (startSurface) {
     const Trk::Layer* startLayer = startSurface->associatedLayer();
     ATH_MSG_DEBUG("Starting Layer: " << layerRZoutput(startLayer));
@@ -936,13 +1041,14 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateToIntermediateLayer(
   const Trk::MultiComponentState* initialState = &multiComponentState;
 
   // Propagate over all components
-  Trk::MultiComponentState destinationState = multiStatePropagate(ctx,
-                                                                  propagator,
-                                                                  *initialState,
-                                                                  layer.surfaceRepresentation(),
-                                                                  direction,
-                                                                  true,
-                                                                  particleHypothesis);
+  Trk::MultiComponentState destinationState =
+    multiStatePropagate(ctx,
+                        propagator,
+                        *initialState,
+                        layer.surfaceRepresentation(),
+                        direction,
+                        true,
+                        particleHypothesis);
 
   if (destinationState.empty()) {
     ATH_MSG_DEBUG("Multi-state propagation failed... Returning 0!");
@@ -950,13 +1056,16 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateToIntermediateLayer(
   }
 
   // the layer has been intersected
-  // ------------------------------------------------------------------------ check for radial
-  // direction change ---------------------------------------------------------------------
+  // ------------------------------------------------------------------------
+  // check for radial direction change
+  // ---------------------------------------------------------------------
   int rDirection = radialDirection(multiComponentState, direction);
   int newrDirection = radialDirection(destinationState, direction);
   if (newrDirection != rDirection && doPerpCheck) {
-    // it is unfortunate that the cancelling could invalidate the material collection
-    ATH_MSG_DEBUG("  [!] Perpendicular direction of track has changed -- checking");
+    // it is unfortunate that the cancelling could invalidate the material
+    // collection
+    ATH_MSG_DEBUG(
+      "  [!] Perpendicular direction of track has changed -- checking");
     // reset the nextParameters if the radial change is not allowed
     //  resetting is ok - since the parameters are in the garbage bin already
     if (!radialDirectionCheck(ctx,
@@ -966,7 +1075,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateToIntermediateLayer(
                               trackingVolume,
                               direction,
                               particleHypothesis)) {
-      ATH_MSG_DEBUG("  [+] Perpendicular direction check cancelled this layer intersection.");
+      ATH_MSG_DEBUG("  [+] Perpendicular direction check cancelled this layer "
+                    "intersection.");
       return {};
     }
   }
@@ -975,14 +1085,18 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateToIntermediateLayer(
      Material effects
      ------------------------------------- */
 
-  Trk::MultiComponentState updatedState =
-    m_materialUpdator->update(destinationState, layer, direction, particleHypothesis);
+  Trk::MultiComponentState updatedState = m_materialUpdator->update(
+    destinationState, layer, direction, particleHypothesis);
 
   if (updatedState.empty()) {
     return destinationState;
   }
 
-  addMaterialtoVector(cache, &layer, updatedState.begin()->first.get(), direction, particleHypothesis);
+  addMaterialtoVector(cache,
+                      &layer,
+                      updatedState.begin()->first.get(),
+                      direction,
+                      particleHypothesis);
 
   return updatedState;
 }
@@ -990,7 +1104,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateToIntermediateLayer(
 /*
    Extrapolate to Destination Layer
 */
-Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateToDestinationLayer(
+Trk::MultiComponentState
+Trk::GsfExtrapolator::extrapolateToDestinationLayer(
   const EventContext& ctx,
   Cache& cache,
   const Trk::IPropagator& propagator,
@@ -1008,20 +1123,22 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateToDestinationLayer(
   const Trk::TrackParameters* combinedState = nullptr;
 
   // Propagate over all components
-  Trk::MultiComponentState destinationState = multiStatePropagate(ctx,
-                                                                  propagator,
-                                                                  multiComponentState,
-                                                                  surface,
-                                                                  direction,
-                                                                  boundaryCheck,
-                                                                  particleHypothesis);
-
-  // Require a fall-back if the initial state is close to the destination surface then a fall-back
-  // solution is required
+  Trk::MultiComponentState destinationState =
+    multiStatePropagate(ctx,
+                        propagator,
+                        multiComponentState,
+                        surface,
+                        direction,
+                        boundaryCheck,
+                        particleHypothesis);
+
+  // Require a fall-back if the initial state is close to the destination
+  // surface then a fall-back solution is required
 
   if (destinationState.empty()) {
     combinedState = initialState->begin()->first.get();
-    if (surface.isOnSurface(combinedState->position(), true, 0.5 * layer.thickness())) {
+    if (surface.isOnSurface(
+          combinedState->position(), true, 0.5 * layer.thickness())) {
       ATH_MSG_DEBUG("Initiating fall-back from failed propagation");
       destinationState = multiStatePropagate(ctx,
                                              propagator,
@@ -1044,21 +1161,27 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateToDestinationLayer(
 
   Trk::MultiComponentState updatedState{};
   if (startLayer != &layer) {
-    updatedState = m_materialUpdator->preUpdate(destinationState, layer, direction, particleHypothesis);
+    updatedState = m_materialUpdator->preUpdate(
+      destinationState, layer, direction, particleHypothesis);
   }
 
-  if (updatedState.empty()){
+  if (updatedState.empty()) {
     return destinationState;
   }
- 
-  addMaterialtoVector(cache, &layer, updatedState.begin()->first.get(), direction, particleHypothesis);
+
+  addMaterialtoVector(cache,
+                      &layer,
+                      updatedState.begin()->first.get(),
+                      direction,
+                      particleHypothesis);
   return updatedState;
 }
 
 /*
  * Extrapolate based on material on active surfaces
  */
-Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateSurfaceBasedMaterialEffects(
+Trk::MultiComponentState
+Trk::GsfExtrapolator::extrapolateSurfaceBasedMaterialEffects(
   const EventContext& ctx,
   const IPropagator& propagator,
   const MultiComponentState& multiComponentState,
@@ -1074,7 +1197,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateSurfaceBasedMaterialEf
 
   // Check the multi-component state is populated
   if (multiComponentState.empty()) {
-    ATH_MSG_WARNING("Multi component state passed to extrapolateInsideVolume is not populated... returning 0");
+    ATH_MSG_WARNING("Multi component state passed to extrapolateInsideVolume "
+                    "is not populated... returning 0");
     return {};
   }
 
@@ -1098,7 +1222,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateSurfaceBasedMaterialEf
      ---------------------------------------- */
 
   Trk::MultiComponentState finalState =
-    m_materialUpdator->simplifiedMaterialUpdate(lastState, direction, particleHypothesis);
+    m_materialUpdator->simplifiedMaterialUpdate(
+      lastState, direction, particleHypothesis);
   if (finalState.empty()) {
     ATH_MSG_DEBUG("Simple material effects updator failed");
     return lastState;
@@ -1110,7 +1235,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::extrapolateSurfaceBasedMaterialEf
  * Multi-component state propagate
  */
 
-Trk::MultiComponentState Trk::GsfExtrapolator::multiStatePropagate(
+Trk::MultiComponentState
+Trk::GsfExtrapolator::multiStatePropagate(
   const EventContext& ctx,
   const IPropagator& propagator,
   const Trk::MultiComponentState& multiComponentState,
@@ -1120,30 +1246,34 @@ Trk::MultiComponentState Trk::GsfExtrapolator::multiStatePropagate(
   ParticleHypothesis particleHypothesis) const
 {
 
-  ATH_MSG_DEBUG("GSF multiStatePropagate() propagating " << multiComponentState.size() << " components\n"
-                                                         << "\t\t\t\t\t...Propagating to surface [r,z] ["
-                                                         << surface.center().perp() << ",\t" << surface.center().z()
-                                                         << ']');
+  ATH_MSG_DEBUG("GSF multiStatePropagate() propagating "
+                << multiComponentState.size() << " components\n"
+                << "\t\t\t\t\t...Propagating to surface [r,z] ["
+                << surface.center().perp() << ",\t" << surface.center().z()
+                << ']');
   const Trk::Layer* layer = surface.associatedLayer();
   ATH_MSG_DEBUG("...associated layer to surface " << layerRZoutput(layer));
 
   Trk::MultiComponentState propagatedState{};
   propagatedState.reserve(multiComponentState.size());
-  Trk::MultiComponentState::const_iterator component = multiComponentState.begin();
+  Trk::MultiComponentState::const_iterator component =
+    multiComponentState.begin();
   double sumw(0); // HACK variable to avoid propagation errors
   for (; component != multiComponentState.end(); ++component) {
     const Trk::TrackParameters* currentParameters = component->first.get();
     if (!currentParameters) {
-      ATH_MSG_DEBUG("Component parameters not defined... component will not be propagated... continuing");
+      ATH_MSG_DEBUG("Component parameters not defined... component will not be "
+                    "propagated... continuing");
       continue;
     }
-    Trk::TrackParameters* propagatedParameters = propagator.propagate(ctx,
-                                                                      *currentParameters,
-                                                                      surface,
-                                                                      direction,
-                                                                      boundaryCheck,
-                                                                      m_fieldProperties,
-                                                                      particleHypothesis);
+    Trk::TrackParameters* propagatedParameters =
+      propagator.propagate(ctx,
+                           *currentParameters,
+                           surface,
+                           direction,
+                           boundaryCheck,
+                           m_fieldProperties,
+                           particleHypothesis);
     if (!propagatedParameters) {
       ATH_MSG_DEBUG("Propagation of component failed... continuing");
       continue;
@@ -1153,7 +1283,8 @@ Trk::MultiComponentState Trk::GsfExtrapolator::multiStatePropagate(
     propagatedState.emplace_back(propagatedParameters, component->second);
   }
 
-  ATH_MSG_DEBUG("GSF multiStatePropagate() propagated  " << propagatedState.size() << "components");
+  ATH_MSG_DEBUG("GSF multiStatePropagate() propagated  "
+                << propagatedState.size() << "components");
   // Protect against empty propagation
   if (propagatedState.empty() || sumw < 0.1) {
     ATH_MSG_DEBUG("multiStatePropagate failed... ");
@@ -1166,29 +1297,36 @@ Trk::MultiComponentState Trk::GsfExtrapolator::multiStatePropagate(
  * PropagatorType
  */
 unsigned int
-Trk::GsfExtrapolator::propagatorType(const Trk::TrackingVolume& trackingVolume) const
+Trk::GsfExtrapolator::propagatorType(
+  const Trk::TrackingVolume& trackingVolume) const
 {
   if (m_propagatorStickyConfiguration) {
-    if (m_propagators.size() > m_propagatorConfigurationLevel)
+    if (m_propagators.size() > m_propagatorConfigurationLevel) {
       return m_propagatorConfigurationLevel;
-    ATH_MSG_WARNING("Misconfigured propagator type, set to " << m_propagatorConfigurationLevel << "->0");
+    }
+    ATH_MSG_WARNING("Misconfigured propagator type, set to "
+                    << m_propagatorConfigurationLevel << "->0");
     return 0;
   }
 
   // Determine what sort of magnetic field is present
   unsigned int magneticFieldMode = m_fieldProperties.magneticFieldMode();
 
-  // Chose between runge-kutta and step propagators depending on field magnetic field and material
-  // properties ST : the following check may fail as the dEdX is often dummy for dense volumes -
-  // switch to rho or zOverAtimesRho ?
-  unsigned int propagatorMode = (magneticFieldMode > 1 && fabs(trackingVolume.dEdX) < 10e-2) ? 2 : 3;
+  // Chose between runge-kutta and step propagators depending on field magnetic
+  // field and material properties ST : the following check may fail as the dEdX
+  // is often dummy for dense volumes - switch to rho or zOverAtimesRho ?
+  unsigned int propagatorMode =
+    (magneticFieldMode > 1 && fabs(trackingVolume.dEdX) < 10e-2) ? 2 : 3;
 
-  unsigned int returnType =
-    (propagatorMode > m_propagatorConfigurationLevel) ? m_propagatorConfigurationLevel : propagatorMode;
+  unsigned int returnType = (propagatorMode > m_propagatorConfigurationLevel)
+                              ? m_propagatorConfigurationLevel
+                              : propagatorMode;
 
-  if (m_propagators.size() > returnType)
+  if (m_propagators.size() > returnType) {
     return returnType;
-  ATH_MSG_WARNING("Misconfigured propagator type, set to " << returnType << "->0");
+  }
+  ATH_MSG_WARNING("Misconfigured propagator type, set to " << returnType
+                                                           << "->0");
   return 0;
 }
 
@@ -1197,31 +1335,37 @@ Trk::GsfExtrapolator::propagatorType(const Trk::TrackingVolume& trackingVolume)
  */
 
 void
-Trk::GsfExtrapolator::initialiseNavigation(const EventContext& ctx,
-                                           Cache& cache,
-                                           const Trk::IPropagator& propagator,
-                                           const Trk::MultiComponentState& multiComponentState,
-                                           const Trk::Surface& surface,
-                                           const Trk::Layer*& currentLayer,
-                                           const Trk::TrackingVolume*& currentVolume,
-                                           const Trk::TrackingVolume*& destinationVolume,
-                                           const Trk::TrackParameters*& referenceParameters,
-                                           Trk::PropDirection direction) const
+Trk::GsfExtrapolator::initialiseNavigation(
+  const EventContext& ctx,
+  Cache& cache,
+  const Trk::IPropagator& propagator,
+  const Trk::MultiComponentState& multiComponentState,
+  const Trk::Surface& surface,
+  const Trk::Layer*& currentLayer,
+  const Trk::TrackingVolume*& currentVolume,
+  const Trk::TrackingVolume*& destinationVolume,
+  const Trk::TrackParameters*& referenceParameters,
+  Trk::PropDirection direction) const
 {
 
   ATH_MSG_DEBUG("initialiseNavigation !!!");
   // Empty the garbage bin
-  ATH_MSG_DEBUG("Destination to surface [r,z] [" << surface.center().perp() << ",\t" << surface.center().z() << ']');
+  ATH_MSG_DEBUG("Destination to surface [r,z] ["
+                << surface.center().perp() << ",\t" << surface.center().z()
+                << ']');
   emptyGarbageBins(cache);
-  const Trk::TrackParameters* combinedState = multiComponentState.begin()->first.get();
+  const Trk::TrackParameters* combinedState =
+    multiComponentState.begin()->first.get();
   /* =============================================
      Look for current volume
      ============================================= */
   // 1. See if the current layer is associated with a tracking volume
 
   const Trk::Surface* associatedSurface = &(combinedState->associatedSurface());
-  currentLayer = associatedSurface ? associatedSurface->associatedLayer() : currentLayer;
-  currentVolume = currentLayer ? currentLayer->enclosingTrackingVolume() : currentVolume;
+  currentLayer =
+    associatedSurface ? associatedSurface->associatedLayer() : currentLayer;
+  currentVolume =
+    currentLayer ? currentLayer->enclosingTrackingVolume() : currentVolume;
 
   // If the association method failed then try the recall method
 
@@ -1235,7 +1379,9 @@ Trk::GsfExtrapolator::initialiseNavigation(const EventContext& ctx,
     // If the recall method fails then the cashed information needs to be reset
     resetRecallInformation(cache);
     currentVolume = m_navigator->volume(combinedState->position());
-    currentLayer = (currentVolume) ? currentVolume->associatedLayer(combinedState->position()) : nullptr;
+    currentLayer = (currentVolume)
+                     ? currentVolume->associatedLayer(combinedState->position())
+                     : nullptr;
   }
   /* =============================================
      Determine the resolved direction
@@ -1247,14 +1393,19 @@ Trk::GsfExtrapolator::initialiseNavigation(const EventContext& ctx,
       ATH_MSG_DEBUG("Any direction initialisation");
     }
     referenceParameters =
-      currentVolume ? propagator.propagateParameters(
-                        ctx, *combinedState, surface, direction, false, m_fieldProperties)
-                    : nullptr;
-    // These parameters will need to be deleted later. Add to list of garbage to be collected
+      currentVolume
+        ? propagator.propagateParameters(
+            ctx, *combinedState, surface, direction, false, m_fieldProperties)
+        : nullptr;
+    // These parameters will need to be deleted later. Add to list of garbage to
+    // be collected
     throwIntoGarbageBin(cache, referenceParameters);
     if (referenceParameters) {
-      Amg::Vector3D surfaceDirection(referenceParameters->position() - combinedState->position());
-      direction = (surfaceDirection.dot(combinedState->momentum()) > 0.) ? Trk::alongMomentum : Trk::oppositeMomentum;
+      Amg::Vector3D surfaceDirection(referenceParameters->position() -
+                                     combinedState->position());
+      direction = (surfaceDirection.dot(combinedState->momentum()) > 0.)
+                    ? Trk::alongMomentum
+                    : Trk::oppositeMomentum;
     }
   }
 
@@ -1263,9 +1414,12 @@ Trk::GsfExtrapolator::initialiseNavigation(const EventContext& ctx,
      ============================================= */
 
   // 1. See if the destination layer is associated with a tracking volume
-  destinationVolume = surface.associatedLayer() ? surface.associatedLayer()->enclosingTrackingVolume() : nullptr;
-  if (!surface.associatedLayer())
+  destinationVolume = surface.associatedLayer()
+                        ? surface.associatedLayer()->enclosingTrackingVolume()
+                        : nullptr;
+  if (!surface.associatedLayer()) {
     ATH_MSG_DEBUG("No layer associated to the surface");
+  }
 
   // 2. See if there is a cashed recall surface
   if (!destinationVolume && &surface == cache.m_recallSurface) {
@@ -1277,7 +1431,8 @@ Trk::GsfExtrapolator::initialiseNavigation(const EventContext& ctx,
           ? propagator.propagateParameters(
               ctx, *combinedState, surface, direction, false, m_fieldProperties)
           : nullptr;
-      // These parameters will need to be deleted later. Add to list of garbage to be collected
+      // These parameters will need to be deleted later. Add to list of garbage
+      // to be collected
       throwIntoGarbageBin(cache, referenceParameters);
     }
 
@@ -1290,14 +1445,16 @@ Trk::GsfExtrapolator::initialiseNavigation(const EventContext& ctx,
           ? propagator.propagateParameters(
               ctx, *combinedState, surface, direction, false, m_fieldProperties)
           : nullptr;
-      // These parameters will need to be deleted later. Add to list of garbage to be collected
+      // These parameters will need to be deleted later. Add to list of garbage
+      // to be collected
       throwIntoGarbageBin(cache, referenceParameters);
     }
     // Global search of tracking geometry to find the destination volume
     if (referenceParameters) {
       destinationVolume = m_navigator->volume(referenceParameters->position());
     }
-    // If destination volume is still not found then global search based on surface position
+    // If destination volume is still not found then global search based on
+    // surface position
     else {
       destinationVolume = m_navigator->volume(surface.globalReferencePoint());
     }
@@ -1329,22 +1486,30 @@ Trk::GsfExtrapolator::addMaterialtoVector(Cache& cache,
   // Get the surface associated with the parameters
   const Trk::Surface* surface = &(nextPar->associatedSurface());
 
-  // Only utilise the reference material if an associated detector element exists
+  // Only utilise the reference material if an associated detector element
+  // exists
   if (surface && surface->associatedDetectorElement()) {
 
     // Get the layer material properties
-    const Trk::LayerMaterialProperties* layerMaterial = nextLayer->layerMaterialProperties();
+    const Trk::LayerMaterialProperties* layerMaterial =
+      nextLayer->layerMaterialProperties();
 
     // Assign the material properties
-    materialProperties = layerMaterial ? layerMaterial->fullMaterial(nextPar->position()) : nullptr;
+    materialProperties = layerMaterial
+                           ? layerMaterial->fullMaterial(nextPar->position())
+                           : nullptr;
 
     // Determine the pathCorrection if the material properties exist
-    pathcorr = materialProperties ? 1. / fabs(surface->normal().dot(nextPar->momentum().unit())) : 0.;
+    pathcorr = materialProperties
+                 ? 1. / fabs(surface->normal().dot(nextPar->momentum().unit()))
+                 : 0.;
   }
 
-  // Check that the material properties have been defined - if not define them from the layer
-  // information
-  materialProperties = materialProperties ? materialProperties : nextLayer->fullUpdateMaterialProperties(*nextPar);
+  // Check that the material properties have been defined - if not define them
+  // from the layer information
+  materialProperties = materialProperties
+                         ? materialProperties
+                         : nextLayer->fullUpdateMaterialProperties(*nextPar);
 
   if (!materialProperties) {
     ATH_MSG_DEBUG("addMaterialVector:   layer has no MaterialProperties!! ");
@@ -1354,25 +1519,29 @@ Trk::GsfExtrapolator::addMaterialtoVector(Cache& cache,
   if (cache.m_matstates) {
     pathcorr = pathcorr > 0.
                  ? pathcorr
-                 : nextLayer->surfaceRepresentation().pathCorrection(nextPar->position(), nextPar->momentum());
+                 : nextLayer->surfaceRepresentation().pathCorrection(
+                     nextPar->position(), nextPar->momentum());
     double thick = pathcorr * materialProperties->thickness();
     double dInX0 = thick / materialProperties->x0();
     double absP = 1 / fabs(nextPar->parameters()[Trk::qOverP]);
-    double scatsigma = sqrt(m_msupdators->sigmaSquare(*materialProperties, absP, pathcorr, particle));
-    Trk::ScatteringAngles* newsa =
-      new Trk::ScatteringAngles(0, 0, scatsigma / sin(nextPar->parameters()[Trk::theta]), scatsigma);
+    double scatsigma = sqrt(
+      m_msupdators->sigmaSquare(*materialProperties, absP, pathcorr, particle));
+    Trk::ScatteringAngles* newsa = new Trk::ScatteringAngles(
+      0, 0, scatsigma / sin(nextPar->parameters()[Trk::theta]), scatsigma);
     // energy loss
-    Trk::EnergyLoss* eloss =
-      m_elossupdators->energyLoss(*materialProperties, absP, pathcorr, dir, particle, Trk::addNoise);
+    Trk::EnergyLoss* eloss = m_elossupdators->energyLoss(
+      *materialProperties, absP, pathcorr, dir, particle, Trk::addNoise);
 
     // use curvilinear TPs to simplify retrieval by fitters
-    Trk::CurvilinearParameters* cvlTP =
-      new Trk::CurvilinearParameters(nextPar->position(), nextPar->momentum(), nextPar->charge());
-    Trk::MaterialEffectsOnTrack* mefot =
-      new Trk::MaterialEffectsOnTrack(dInX0, newsa, eloss, cvlTP->associatedSurface());
-    cache.m_matstates->push_back(new TrackStateOnSurface(nullptr, cvlTP, nullptr, mefot));
-    ATH_MSG_DEBUG("addMaterialVector: from layer:" << layerRZoutput(nextLayer) << ". Size is now "
-                                                   << cache.m_matstates->size());
+    Trk::CurvilinearParameters* cvlTP = new Trk::CurvilinearParameters(
+      nextPar->position(), nextPar->momentum(), nextPar->charge());
+    Trk::MaterialEffectsOnTrack* mefot = new Trk::MaterialEffectsOnTrack(
+      dInX0, newsa, eloss, cvlTP->associatedSurface());
+    cache.m_matstates->push_back(
+      new TrackStateOnSurface(nullptr, cvlTP, nullptr, mefot));
+    ATH_MSG_DEBUG("addMaterialVector: from layer:"
+                  << layerRZoutput(nextLayer) << ". Size is now "
+                  << cache.m_matstates->size());
   }
 }
 
@@ -1380,10 +1549,13 @@ std::string
 Trk::GsfExtrapolator::layerRZoutput(const Trk::Layer* lay) const
 {
   std::string result("NULL");
-  if (not lay)
+  if (not lay) {
     return result;
-  result = "[r,z] = [ " + std::to_string(lay->surfaceRepresentation().bounds().r()) + ", " +
-           std::to_string(lay->surfaceRepresentation().center().z()) + " ] - Index ";
+  }
+  result = "[r,z] = [ " +
+           std::to_string(lay->surfaceRepresentation().bounds().r()) + ", " +
+           std::to_string(lay->surfaceRepresentation().center().z()) +
+           " ] - Index ";
   result += std::to_string(lay->layerIndex().value());
   return result;
 }
@@ -1392,29 +1564,34 @@ std::string
 Trk::GsfExtrapolator::positionOutput(const Amg::Vector3D& pos) const
 {
   std::stringstream outStream;
-  outStream << "[r,phi,z] = [ " << pos.perp() << ", " << pos.phi() << ", " << pos.z() << " ]";
+  outStream << "[r,phi,z] = [ " << pos.perp() << ", " << pos.phi() << ", "
+            << pos.z() << " ]";
   return outStream.str();
 }
 
 int
-Trk::GsfExtrapolator::radialDirection(const Trk::MultiComponentState& pars, PropDirection dir) const
+Trk::GsfExtrapolator::radialDirection(const Trk::MultiComponentState& pars,
+                                      PropDirection dir) const
 {
   // safe inbound/outbound estimation
   double prePositionR = pars.begin()->first->position().perp();
   return (prePositionR >
-          (pars.begin()->first->position() + dir * 0.5 * prePositionR * pars.begin()->first->momentum().unit()).perp())
+          (pars.begin()->first->position() +
+           dir * 0.5 * prePositionR * pars.begin()->first->momentum().unit())
+            .perp())
            ? -1
            : 1;
 }
 
 bool
-Trk::GsfExtrapolator::radialDirectionCheck(const EventContext& ctx,
-                                           const IPropagator& prop,
-                                           const MultiComponentState& startParm,
-                                           const MultiComponentState& parsOnLayer,
-                                           const TrackingVolume& tvol,
-                                           PropDirection dir,
-                                           ParticleHypothesis particle) const
+Trk::GsfExtrapolator::radialDirectionCheck(
+  const EventContext& ctx,
+  const IPropagator& prop,
+  const MultiComponentState& startParm,
+  const MultiComponentState& parsOnLayer,
+  const TrackingVolume& tvol,
+  PropDirection dir,
+  ParticleHypothesis particle) const
 {
   const Amg::Vector3D& startPosition = startParm.begin()->first->position();
   const Amg::Vector3D& onLayerPosition = parsOnLayer.begin()->first->position();
@@ -1422,12 +1599,15 @@ Trk::GsfExtrapolator::radialDirectionCheck(const EventContext& ctx,
   // the 3D distance to the layer intersection
   double distToLayer = (startPosition - onLayerPosition).mag();
   // get the innermost contained surface for crosscheck
-  const std::vector<SharedObject<const BoundarySurface<TrackingVolume>>>& boundarySurfaces = tvol.boundarySurfaces();
+  const std::vector<SharedObject<const BoundarySurface<TrackingVolume>>>&
+    boundarySurfaces = tvol.boundarySurfaces();
   // only for tubes the crossing makes sense to check for validity
   if (boundarySurfaces.size() == 4) {
     // propagate to the inside surface and compare the distance:
-    // it can be either the next layer from the initial point, or the inner tube boundary surface
-    const Trk::Surface& insideSurface = (boundarySurfaces[Trk::tubeInnerCover].get())->surfaceRepresentation();
+    // it can be either the next layer from the initial point, or the inner tube
+    // boundary surface
+    const Trk::Surface& insideSurface =
+      (boundarySurfaces[Trk::tubeInnerCover].get())->surfaceRepresentation();
     const Trk::TrackParameters* parsOnInsideSurface =
       prop.propagateParameters(ctx,
                                *(startParm.begin()->first),
@@ -1437,18 +1617,25 @@ Trk::GsfExtrapolator::radialDirectionCheck(const EventContext& ctx,
                                m_fieldProperties,
                                particle);
     double distToInsideSurface =
-      parsOnInsideSurface ? (startPosition - (parsOnInsideSurface->position())).mag() : 10e10;
-
-    ATH_MSG_DEBUG("  Radial direction check start - at " << positionOutput(startPosition));
-    ATH_MSG_DEBUG("  Radial direction check layer - at " << positionOutput(onLayerPosition));
-    if (parsOnInsideSurface)
-      ATH_MSG_DEBUG("  Radial direction check inner - at " << positionOutput(parsOnInsideSurface->position()));
+      parsOnInsideSurface
+        ? (startPosition - (parsOnInsideSurface->position())).mag()
+        : 10e10;
+
+    ATH_MSG_DEBUG("  Radial direction check start - at "
+                  << positionOutput(startPosition));
+    ATH_MSG_DEBUG("  Radial direction check layer - at "
+                  << positionOutput(onLayerPosition));
+    if (parsOnInsideSurface) {
+      ATH_MSG_DEBUG("  Radial direction check inner - at "
+                    << positionOutput(parsOnInsideSurface->position()));
+    }
 
     // memory cleanup (no garbage bin, this is faster)
     delete parsOnInsideSurface;
-    ATH_MSG_DEBUG("  Check radial direction: distance layer / boundary = " << distToLayer << " / "
-                                                                           << distToInsideSurface);
-    // the intersection with the original layer is valid if it is before the inside surface
+    ATH_MSG_DEBUG("  Check radial direction: distance layer / boundary = "
+                  << distToLayer << " / " << distToInsideSurface);
+    // the intersection with the original layer is valid if it is before the
+    // inside surface
     return distToLayer < distToInsideSurface;
   }
   return true;
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfMaterialEffectsUpdator.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfMaterialEffectsUpdator.cxx
index 50017bd0f155d3e7702d15d3d56c1ebd93b4bed1..9657a682b8513f15c507950d39186a9ba9f1e9f8 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfMaterialEffectsUpdator.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfMaterialEffectsUpdator.cxx
@@ -7,7 +7,8 @@
                         ---------------------------------------------
 begin                : Wednesday 9th January 2005
 author               : atkinson,morley,anastopoulos
-decription           : Implementation code for the class GsfMaterialEffectsUpdator
+decription           : Implementation code for the class
+GsfMaterialEffectsUpdator
 ***********************************************************************************/
 
 #include "TrkGaussianSumFilter/GsfMaterialEffectsUpdator.h"
@@ -21,9 +22,10 @@ decription           : Implementation code for the class GsfMaterialEffectsUpdat
 #include "TrkGeometry/Layer.h"
 #include "TrkGeometry/MaterialProperties.h"
 
-Trk::GsfMaterialEffectsUpdator::GsfMaterialEffectsUpdator(const std::string& type,
-                                                          const std::string& name,
-                                                          const IInterface* parent)
+Trk::GsfMaterialEffectsUpdator::GsfMaterialEffectsUpdator(
+  const std::string& type,
+  const std::string& name,
+  const IInterface* parent)
   : AthAlgTool(type, name, parent)
   , m_useReferenceMaterial(false)
   , m_momentumCut(250. * Gaudi::Units::MeV)
@@ -53,13 +55,15 @@ Trk::GsfMaterialEffectsUpdator::finalize()
 
 /* ============================================================================
    Full update based on layer information
-   ============================================================================ */
+   ============================================================================
+ */
 
 Trk::MultiComponentState
-Trk::GsfMaterialEffectsUpdator::updateState(const Trk::ComponentParameters& componentParameters,
-                                            const Trk::Layer& layer,
-                                            Trk::PropDirection direction,
-                                            Trk::ParticleHypothesis particleHypothesis) const
+Trk::GsfMaterialEffectsUpdator::updateState(
+  const Trk::ComponentParameters& componentParameters,
+  const Trk::Layer& layer,
+  Trk::PropDirection direction,
+  Trk::ParticleHypothesis particleHypothesis) const
 {
 
   const Trk::TrackParameters* trackParameters = componentParameters.first.get();
@@ -78,23 +82,32 @@ Trk::GsfMaterialEffectsUpdator::updateState(const Trk::ComponentParameters& comp
     // Get the surface associated with the parameters
     const Trk::Surface* surface = &(trackParameters->associatedSurface());
 
-    // Only utilise the reference material if an associated detector element exists
+    // Only utilise the reference material if an associated detector element
+    // exists
     if (surface && surface->associatedDetectorElement()) {
 
       // Get the layer material properties
-      const Trk::LayerMaterialProperties* layerMaterial = layer.layerMaterialProperties();
+      const Trk::LayerMaterialProperties* layerMaterial =
+        layer.layerMaterialProperties();
 
       // Assign the material properties
-      materialProperties = layerMaterial ? layerMaterial->fullMaterial(trackParameters->position()) : nullptr;
+      materialProperties =
+        layerMaterial ? layerMaterial->fullMaterial(trackParameters->position())
+                      : nullptr;
 
       // Determine the pathCorrection if the material properties exist
-      pathCorrection = materialProperties ? 1. / fabs(surface->normal().dot(trackParameters->momentum().unit())) : 0.;
+      pathCorrection =
+        materialProperties
+          ? 1. / fabs(surface->normal().dot(trackParameters->momentum().unit()))
+          : 0.;
     }
   }
 
-  // Check that the material properties have been defined - if not define them from the layer
-  // information
-  materialProperties = materialProperties ? materialProperties : layer.fullUpdateMaterialProperties(*trackParameters);
+  // Check that the material properties have been defined - if not define them
+  // from the layer information
+  materialProperties = materialProperties
+                         ? materialProperties
+                         : layer.fullUpdateMaterialProperties(*trackParameters);
 
   // Bail out if still no material properties can be found
   if (!materialProperties) {
@@ -104,55 +117,73 @@ Trk::GsfMaterialEffectsUpdator::updateState(const Trk::ComponentParameters& comp
   }
 
   // Define the path correction
-  pathCorrection = pathCorrection > 0. ? pathCorrection
-                                       : layer.surfaceRepresentation().pathCorrection(trackParameters->position(),
-                                                                                      trackParameters->momentum());
-
-  // The pathlength ( in mm ) is the path correction * the thickness of the material
+  pathCorrection =
+    pathCorrection > 0.
+      ? pathCorrection
+      : layer.surfaceRepresentation().pathCorrection(
+          trackParameters->position(), trackParameters->momentum());
+
+  // The pathlength ( in mm ) is the path correction * the thickness of the
+  // material
   double pathLength = pathCorrection * materialProperties->thickness();
 
-  auto updatedState = compute(componentParameters, *materialProperties, pathLength, direction, particleHypothesis);
+  auto updatedState = compute(componentParameters,
+                              *materialProperties,
+                              pathLength,
+                              direction,
+                              particleHypothesis);
 
   return updatedState;
 }
 
 /* ============================================================================
    Full update based on path-length & material properties information
-   ============================================================================ */
+   ============================================================================
+ */
 
 Trk::MultiComponentState
-Trk::GsfMaterialEffectsUpdator::updateState(const Trk::ComponentParameters& componentParameters,
-                                            const Trk::MaterialProperties& materialProperties,
-                                            double pathLength,
-                                            Trk::PropDirection direction,
-                                            Trk::ParticleHypothesis particleHypothesis) const
+Trk::GsfMaterialEffectsUpdator::updateState(
+  const Trk::ComponentParameters& componentParameters,
+  const Trk::MaterialProperties& materialProperties,
+  double pathLength,
+  Trk::PropDirection direction,
+  Trk::ParticleHypothesis particleHypothesis) const
 {
-  auto updatedState = compute(componentParameters, materialProperties, pathLength, direction, particleHypothesis);
+  auto updatedState = compute(componentParameters,
+                              materialProperties,
+                              pathLength,
+                              direction,
+                              particleHypothesis);
   return updatedState;
 }
 
 /* ============================================================================
    Pre-update based on layer information
-   ============================================================================ */
+   ============================================================================
+ */
 Trk::MultiComponentState
-Trk::GsfMaterialEffectsUpdator::preUpdateState(const Trk::ComponentParameters& componentParameters,
-                                               const Trk::Layer& layer,
-                                               Trk::PropDirection direction,
-                                               Trk::ParticleHypothesis particleHypothesis) const
+Trk::GsfMaterialEffectsUpdator::preUpdateState(
+  const Trk::ComponentParameters& componentParameters,
+  const Trk::Layer& layer,
+  Trk::PropDirection direction,
+  Trk::ParticleHypothesis particleHypothesis) const
 {
 
-  ATH_MSG_DEBUG("Material effects update prior to propagation using layer information and particle hypothesis: "
+  ATH_MSG_DEBUG("Material effects update prior to propagation using layer "
+                "information and particle hypothesis: "
                 << particleHypothesis);
 
   const Trk::TrackParameters* trackParameters = componentParameters.first.get();
 
   if (!trackParameters) {
-    ATH_MSG_ERROR("Trying to update component without trackParameters... returing 0!");
+    ATH_MSG_ERROR(
+      "Trying to update component without trackParameters... returing 0!");
     return {};
   }
 
   // Get the pre-update factor
-  double preUpdateFactor = layer.preUpdateMaterialFactor(*trackParameters, direction);
+  double preUpdateFactor =
+    layer.preUpdateMaterialFactor(*trackParameters, direction);
 
   // Bail if the pre-update factor is small
   if (preUpdateFactor < 0.01) {
@@ -169,70 +200,92 @@ Trk::GsfMaterialEffectsUpdator::preUpdateState(const Trk::ComponentParameters& c
     // Get the surface associated with the parameters
     const Trk::Surface* surface = &(trackParameters->associatedSurface());
 
-    // Only utilise the reference material if an associated detector element exists
+    // Only utilise the reference material if an associated detector element
+    // exists
     if (surface && surface->associatedDetectorElement()) {
 
       // Get the layer material properties
-      const Trk::LayerMaterialProperties* layerMaterial = layer.layerMaterialProperties();
+      const Trk::LayerMaterialProperties* layerMaterial =
+        layer.layerMaterialProperties();
 
       // Assign the material properties
-      materialProperties = layerMaterial ? layerMaterial->fullMaterial(trackParameters->position()) : nullptr;
+      materialProperties =
+        layerMaterial ? layerMaterial->fullMaterial(trackParameters->position())
+                      : nullptr;
 
       // Determine the pathCorrection if the material properties exist
-      pathCorrection = materialProperties ? 1. / fabs(surface->normal().dot(trackParameters->momentum().unit())) : 0.;
+      pathCorrection =
+        materialProperties
+          ? 1. / fabs(surface->normal().dot(trackParameters->momentum().unit()))
+          : 0.;
     }
   }
 
-  // Check that the material properties have been defined - if not define them from the layer
-  // information
-  materialProperties = materialProperties ? materialProperties : layer.fullUpdateMaterialProperties(*trackParameters);
+  // Check that the material properties have been defined - if not define them
+  // from the layer information
+  materialProperties = materialProperties
+                         ? materialProperties
+                         : layer.fullUpdateMaterialProperties(*trackParameters);
 
   // Bail out if still no material properties can be found
   if (!materialProperties) {
     Trk::MultiComponentState clonedMultiComponentState{};
-    clonedMultiComponentState.emplace_back(componentParameters.first->clone(), componentParameters.second);
+    clonedMultiComponentState.emplace_back(componentParameters.first->clone(),
+                                           componentParameters.second);
     return clonedMultiComponentState;
   }
 
   // Define the path correction
-  pathCorrection = pathCorrection > 0. ? pathCorrection
-                                       : layer.surfaceRepresentation().pathCorrection(trackParameters->position(),
-                                                                                      trackParameters->momentum());
+  pathCorrection =
+    pathCorrection > 0.
+      ? pathCorrection
+      : layer.surfaceRepresentation().pathCorrection(
+          trackParameters->position(), trackParameters->momentum());
 
   // Scale the correction by the pre-update factor
   pathCorrection *= preUpdateFactor;
 
-  // The pathlength ( in mm ) is the path correction * the thickness of the material
+  // The pathlength ( in mm ) is the path correction * the thickness of the
+  // material
   double pathLength = pathCorrection * materialProperties->thickness();
 
-  auto updatedState = compute(componentParameters, *materialProperties, pathLength, direction, particleHypothesis);
+  auto updatedState = compute(componentParameters,
+                              *materialProperties,
+                              pathLength,
+                              direction,
+                              particleHypothesis);
 
   return updatedState;
 }
 
 /* ============================================================================
    Post-update based on layer information
-   ============================================================================ */
+   ============================================================================
+ */
 
 Trk::MultiComponentState
-Trk::GsfMaterialEffectsUpdator::postUpdateState(const Trk::ComponentParameters& componentParameters,
-                                                const Layer& layer,
-                                                PropDirection direction,
-                                                ParticleHypothesis particleHypothesis) const
+Trk::GsfMaterialEffectsUpdator::postUpdateState(
+  const Trk::ComponentParameters& componentParameters,
+  const Layer& layer,
+  PropDirection direction,
+  ParticleHypothesis particleHypothesis) const
 {
 
-  ATH_MSG_DEBUG("Material effects update after propagation using layer information and particle hypothesis: "
+  ATH_MSG_DEBUG("Material effects update after propagation using layer "
+                "information and particle hypothesis: "
                 << particleHypothesis);
 
   Trk::TrackParameters* trackParameters = componentParameters.first.get();
 
   if (!trackParameters) {
-    ATH_MSG_ERROR("Trying to update component without trackParameters... returing component!");
+    ATH_MSG_ERROR("Trying to update component without trackParameters... "
+                  "returing component!");
     return {};
   }
 
   // Get the post-update factor
-  double postUpdateFactor = layer.postUpdateMaterialFactor(*trackParameters, direction);
+  double postUpdateFactor =
+    layer.postUpdateMaterialFactor(*trackParameters, direction);
 
   // Bail if the postUpdateFactor is small
   if (postUpdateFactor < 0.01) {
@@ -247,55 +300,73 @@ Trk::GsfMaterialEffectsUpdator::postUpdateState(const Trk::ComponentParameters&
     // Get the surface associated with the parameters
     const Trk::Surface* surface = &(trackParameters->associatedSurface());
 
-    // Only utilise the reference material if an associated detector element exists
+    // Only utilise the reference material if an associated detector element
+    // exists
     if (surface && surface->associatedDetectorElement()) {
 
       // Get the layer material properties
-      const Trk::LayerMaterialProperties* layerMaterial = layer.layerMaterialProperties();
+      const Trk::LayerMaterialProperties* layerMaterial =
+        layer.layerMaterialProperties();
 
       // Assign the material properties
-      materialProperties = layerMaterial ? layerMaterial->fullMaterial(trackParameters->position()) : nullptr;
+      materialProperties =
+        layerMaterial ? layerMaterial->fullMaterial(trackParameters->position())
+                      : nullptr;
 
       // Determine the pathCorrection if the material properties exist
-      pathCorrection = materialProperties ? 1. / fabs(surface->normal().dot(trackParameters->momentum().unit())) : 0.;
+      pathCorrection =
+        materialProperties
+          ? 1. / fabs(surface->normal().dot(trackParameters->momentum().unit()))
+          : 0.;
     }
   }
 
-  // Check that the material properties have been defined - if not define them from the layer
-  // information
-  materialProperties = materialProperties ? materialProperties : layer.fullUpdateMaterialProperties(*trackParameters);
+  // Check that the material properties have been defined - if not define them
+  // from the layer information
+  materialProperties = materialProperties
+                         ? materialProperties
+                         : layer.fullUpdateMaterialProperties(*trackParameters);
 
   // Bail out if still no material properties can be found
   if (!materialProperties) {
     Trk::MultiComponentState clonedMultiComponentState{};
-    clonedMultiComponentState.emplace_back(componentParameters.first->clone(), componentParameters.second);
+    clonedMultiComponentState.emplace_back(componentParameters.first->clone(),
+                                           componentParameters.second);
     return clonedMultiComponentState;
   }
 
   // Define the path correction
-  pathCorrection = pathCorrection > 0. ? pathCorrection
-                                       : layer.surfaceRepresentation().pathCorrection(trackParameters->position(),
-                                                                                      trackParameters->momentum());
+  pathCorrection =
+    pathCorrection > 0.
+      ? pathCorrection
+      : layer.surfaceRepresentation().pathCorrection(
+          trackParameters->position(), trackParameters->momentum());
   // Scale the correction by the pre-update factor
   pathCorrection *= postUpdateFactor;
 
-  // The pathlength ( in mm ) is the path correction * the thickness of the material
+  // The pathlength ( in mm ) is the path correction * the thickness of the
+  // material
   double pathLength = pathCorrection * materialProperties->thickness();
 
-  return compute(componentParameters, *materialProperties, pathLength, direction, particleHypothesis);
-
+  return compute(componentParameters,
+                 *materialProperties,
+                 pathLength,
+                 direction,
+                 particleHypothesis);
 }
 
 /* ============================================================================
    Compute method
-   ============================================================================ */
+   ============================================================================
+ */
 
 Trk::MultiComponentState
-Trk::GsfMaterialEffectsUpdator::compute(const Trk::ComponentParameters& componentParameters,
-                                        const Trk::MaterialProperties& materialProperties,
-                                        double pathLength,
-                                        Trk::PropDirection direction,
-                                        Trk::ParticleHypothesis particleHypothesis) const
+Trk::GsfMaterialEffectsUpdator::compute(
+  const Trk::ComponentParameters& componentParameters,
+  const Trk::MaterialProperties& materialProperties,
+  double pathLength,
+  Trk::PropDirection direction,
+  Trk::ParticleHypothesis particleHypothesis) const
 {
 
   double momentum = componentParameters.first->momentum().mag();
@@ -303,7 +374,8 @@ Trk::GsfMaterialEffectsUpdator::compute(const Trk::ComponentParameters& componen
   if (momentum <= m_momentumCut) {
     ATH_MSG_DEBUG("Ignoring material effects... Momentum too low");
     Trk::MultiComponentState clonedMultiComponentState{};
-    clonedMultiComponentState.emplace_back(componentParameters.first->clone(), componentParameters.second);
+    clonedMultiComponentState.emplace_back(componentParameters.first->clone(),
+                                           componentParameters.second);
     return clonedMultiComponentState;
   }
 
@@ -316,11 +388,17 @@ Trk::GsfMaterialEffectsUpdator::compute(const Trk::ComponentParameters& componen
   const AmgSymMatrix(5)* measuredCov = trackParameters->covariance();
 
   Trk::IMultiStateMaterialEffects::Cache cache;
-  m_materialEffects->compute(cache, componentParameters, materialProperties, pathLength, direction, particleHypothesis);
+  m_materialEffects->compute(cache,
+                             componentParameters,
+                             materialProperties,
+                             pathLength,
+                             direction,
+                             particleHypothesis);
 
   // check all vectors have the same size
   if (cache.weights.size() != cache.deltaPs.size()) {
-    ATH_MSG_ERROR("Inconsistent number of components in the updator!!! return nullptr");
+    ATH_MSG_ERROR(
+      "Inconsistent number of components in the updator!!! return nullptr");
     return {};
   }
 
@@ -332,25 +410,28 @@ Trk::GsfMaterialEffectsUpdator::compute(const Trk::ComponentParameters& componen
   for (; componentIndex < cache.weights.size(); ++componentIndex) {
     AmgVector(5) updatedStateVector = trackParameters->parameters();
 
-    // Adjust the momentum of the component's parameters vector here. Check to make sure update is
-    // good.
+    // Adjust the momentum of the component's parameters vector here. Check to
+    // make sure update is good.
     if (!updateP(updatedStateVector, cache.deltaPs[componentIndex])) {
       ATH_MSG_ERROR("Cannot update state vector momentum!!! return nullptr");
       return {};
     }
 
     AmgSymMatrix(5)* updatedCovariance = nullptr;
-    if (measuredCov && cache.deltaCovariances.size()>componentIndex) {
-      updatedCovariance = new AmgSymMatrix(5)(cache.deltaCovariances[componentIndex] + *measuredCov);
+    if (measuredCov && cache.deltaCovariances.size() > componentIndex) {
+      updatedCovariance = new AmgSymMatrix(5)(
+        cache.deltaCovariances[componentIndex] + *measuredCov);
     }
     Trk::TrackParameters* updatedTrackParameters =
-      trackParameters->associatedSurface().createTrackParameters(updatedStateVector[Trk::loc1],
-                                                                 updatedStateVector[Trk::loc2],
-                                                                 updatedStateVector[Trk::phi],
-                                                                 updatedStateVector[Trk::theta],
-                                                                 updatedStateVector[Trk::qOverP],
-                                                                 updatedCovariance);
-    double updatedWeight = componentParameters.second * cache.weights[componentIndex];
+      trackParameters->associatedSurface().createTrackParameters(
+        updatedStateVector[Trk::loc1],
+        updatedStateVector[Trk::loc2],
+        updatedStateVector[Trk::phi],
+        updatedStateVector[Trk::theta],
+        updatedStateVector[Trk::qOverP],
+        updatedCovariance);
+    double updatedWeight =
+      componentParameters.second * cache.weights[componentIndex];
     computedState.emplace_back(updatedTrackParameters, updatedWeight);
   }
   return computedState;
@@ -358,10 +439,12 @@ Trk::GsfMaterialEffectsUpdator::compute(const Trk::ComponentParameters& componen
 
 /* ============================================================================
    updateP method
-   ============================================================================ */
+   ============================================================================
+ */
 
 bool
-Trk::GsfMaterialEffectsUpdator::updateP(AmgVector(5) & stateVector, double deltaP) const
+Trk::GsfMaterialEffectsUpdator::updateP(AmgVector(5) & stateVector,
+                                        double deltaP) const
 {
   double p = 1. / fabs(stateVector[Trk::qOverP]);
   p += deltaP;
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfMaterialMixtureConvolution.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfMaterialMixtureConvolution.cxx
index 2b42448fff656124c70d3085ca7ca76a9bd63f21..438bb317b845b090869ba45e02fbd2a9f18af03d 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfMaterialMixtureConvolution.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfMaterialMixtureConvolution.cxx
@@ -22,9 +22,10 @@ decription           : Implementation code for GSF material mixture convolution
 #include "TrkMultiComponentStateOnSurface/MultiComponentState.h"
 #include "TrkSurfaces/PerigeeSurface.h"
 
-Trk::GsfMaterialMixtureConvolution::GsfMaterialMixtureConvolution(const std::string& type,
-                                                                  const std::string& name,
-                                                                  const IInterface* parent)
+Trk::GsfMaterialMixtureConvolution::GsfMaterialMixtureConvolution(
+  const std::string& type,
+  const std::string& name,
+  const IInterface* parent)
   : AthAlgTool(type, name, parent)
 {
   declareInterface<IMaterialMixtureConvolution>(this);
@@ -37,12 +38,11 @@ Trk::GsfMaterialMixtureConvolution::initialize()
 {
 
   if (m_updator.retrieve().isFailure()) {
-    ATH_MSG_ERROR("Could not retrieve the material effects updator instance " << m_updator.typeAndName()
-                                                                              << "... Exiting");
+    ATH_MSG_ERROR("Could not retrieve the material effects updator instance "
+                  << m_updator.typeAndName() << "... Exiting");
     return StatusCode::FAILURE;
   }
 
-
   return StatusCode::SUCCESS;
 }
 
@@ -57,10 +57,11 @@ Trk::GsfMaterialMixtureConvolution::finalize()
    ========================================== */
 
 Trk::MultiComponentState
-Trk::GsfMaterialMixtureConvolution::update(const Trk::MultiComponentState& multiComponentState,
-                                           const Trk::Layer& layer,
-                                           Trk::PropDirection direction,
-                                           Trk::ParticleHypothesis particleHypothesis) const
+Trk::GsfMaterialMixtureConvolution::update(
+  const Trk::MultiComponentState& multiComponentState,
+  const Trk::Layer& layer,
+  Trk::PropDirection direction,
+  Trk::ParticleHypothesis particleHypothesis) const
 {
 
   const Trk::MaterialProperties* materialProperties =
@@ -81,34 +82,39 @@ Trk::GsfMaterialMixtureConvolution::update(const Trk::MultiComponentState& multi
 
   // Check the multi-component state is populated
   if (multiComponentState.empty()) {
-    ATH_MSG_DEBUG("Multi component state passed to extrapolateInsideVolume is not populated... returning 0");
+    ATH_MSG_DEBUG("Multi component state passed to extrapolateInsideVolume is "
+                  "not populated... returning 0");
     return {};
   }
 
   // Loop over all components and perform material effects update separately
-  Trk::MultiComponentState::const_iterator component = multiComponentState.begin();
+  Trk::MultiComponentState::const_iterator component =
+    multiComponentState.begin();
 
   for (; component != multiComponentState.end(); ++component) {
 
     Trk::MultiComponentState updatedState =
       m_updator->updateState(*component, layer, direction, particleHypothesis);
 
-    if (updatedState.empty()){
+    if (updatedState.empty()) {
       continue;
     }
 
-    bool componentAdded = MultiComponentStateAssembler::addMultiState(cache, std::move(updatedState));
+    bool componentAdded = MultiComponentStateAssembler::addMultiState(
+      cache, std::move(updatedState));
 
     if (!componentAdded) {
-      ATH_MSG_WARNING("Component could not be added to the state in the assembler");
+      ATH_MSG_WARNING(
+        "Component could not be added to the state in the assembler");
     }
   }
 
-  Trk::MultiComponentState mergedState = QuickCloseComponentsMultiStateMerger::merge(
-    std::move(cache.multiComponentState), m_maximumNumberOfComponents);
+  Trk::MultiComponentState mergedState =
+    QuickCloseComponentsMultiStateMerger::merge(
+      std::move(cache.multiComponentState), m_maximumNumberOfComponents);
 
   if (mergedState.empty()) {
-    return  {};
+    return {};
   }
   // Renormalise state
   MultiComponentStateHelpers::renormaliseState(mergedState);
@@ -121,10 +127,11 @@ Trk::GsfMaterialMixtureConvolution::update(const Trk::MultiComponentState& multi
    ========================================== */
 
 Trk::MultiComponentState
-Trk::GsfMaterialMixtureConvolution::preUpdate(const Trk::MultiComponentState& multiComponentState,
-                                              const Trk::Layer& layer,
-                                              Trk::PropDirection direction,
-                                              Trk::ParticleHypothesis particleHypothesis) const
+Trk::GsfMaterialMixtureConvolution::preUpdate(
+  const Trk::MultiComponentState& multiComponentState,
+  const Trk::Layer& layer,
+  Trk::PropDirection direction,
+  Trk::ParticleHypothesis particleHypothesis) const
 {
   const Trk::MaterialProperties* materialProperties =
     layer.fullUpdateMaterialProperties(*(multiComponentState.begin()->first));
@@ -139,30 +146,36 @@ Trk::GsfMaterialMixtureConvolution::preUpdate(const Trk::MultiComponentState& mu
 
   // Check the multi-component state is populated
   if (multiComponentState.empty()) {
-    ATH_MSG_DEBUG("Multi component state passed to extrapolateInsideVolume is not populated... returning 0");
+    ATH_MSG_DEBUG("Multi component state passed to extrapolateInsideVolume is "
+                  "not populated... returning 0");
     return {};
   }
 
   // Loop over all components and perform material effects update separately
-  Trk::MultiComponentState::const_iterator component = multiComponentState.begin();
+  Trk::MultiComponentState::const_iterator component =
+    multiComponentState.begin();
 
   for (; component != multiComponentState.end(); ++component) {
 
-    Trk::MultiComponentState updatedState =
-      m_updator->preUpdateState(*component, layer, direction, particleHypothesis);
+    Trk::MultiComponentState updatedState = m_updator->preUpdateState(
+      *component, layer, direction, particleHypothesis);
 
-    if (updatedState.empty()){
+    if (updatedState.empty()) {
       continue;
     }
 
-    bool componentAdded = MultiComponentStateAssembler::addMultiState(cache, std::move(updatedState));
+    bool componentAdded = MultiComponentStateAssembler::addMultiState(
+      cache, std::move(updatedState));
 
-    if (!componentAdded)
-      ATH_MSG_WARNING("Component could not be added to the state in the assembler");
+    if (!componentAdded) {
+      ATH_MSG_WARNING(
+        "Component could not be added to the state in the assembler");
+    }
   }
 
-  Trk::MultiComponentState mergedState = QuickCloseComponentsMultiStateMerger::merge(
-    std::move(cache.multiComponentState), m_maximumNumberOfComponents);
+  Trk::MultiComponentState mergedState =
+    QuickCloseComponentsMultiStateMerger::merge(
+      std::move(cache.multiComponentState), m_maximumNumberOfComponents);
 
   if (mergedState.empty()) {
     return {};
@@ -178,10 +191,11 @@ Trk::GsfMaterialMixtureConvolution::preUpdate(const Trk::MultiComponentState& mu
    ========================================== */
 
 Trk::MultiComponentState
-Trk::GsfMaterialMixtureConvolution::postUpdate(const Trk::MultiComponentState& multiComponentState,
-                                               const Trk::Layer& layer,
-                                               Trk::PropDirection direction,
-                                               Trk::ParticleHypothesis particleHypothesis) const
+Trk::GsfMaterialMixtureConvolution::postUpdate(
+  const Trk::MultiComponentState& multiComponentState,
+  const Trk::Layer& layer,
+  Trk::PropDirection direction,
+  Trk::ParticleHypothesis particleHypothesis) const
 {
 
   const Trk::MaterialProperties* materialProperties =
@@ -198,31 +212,36 @@ Trk::GsfMaterialMixtureConvolution::postUpdate(const Trk::MultiComponentState& m
 
   // Check the multi-component state is populated
   if (multiComponentState.empty()) {
-    ATH_MSG_DEBUG("Multi component state passed to extrapolateInsideVolume is not populated... returning 0");
+    ATH_MSG_DEBUG("Multi component state passed to extrapolateInsideVolume is "
+                  "not populated... returning 0");
     return {};
   }
 
   // Loop over all components and perform material effects update separately
-  Trk::MultiComponentState::const_iterator component = multiComponentState.begin();
+  Trk::MultiComponentState::const_iterator component =
+    multiComponentState.begin();
 
   for (; component != multiComponentState.end(); ++component) {
 
-    Trk::MultiComponentState updatedState =
-      m_updator->postUpdateState(*component, layer, direction, particleHypothesis);
+    Trk::MultiComponentState updatedState = m_updator->postUpdateState(
+      *component, layer, direction, particleHypothesis);
 
-    if (updatedState.empty()){
+    if (updatedState.empty()) {
       continue;
     }
 
-    bool componentAdded = MultiComponentStateAssembler::addMultiState(cache, std::move(updatedState));
+    bool componentAdded = MultiComponentStateAssembler::addMultiState(
+      cache, std::move(updatedState));
 
     if (!componentAdded) {
-      ATH_MSG_WARNING("Component could not be added to the state in the assembler");
+      ATH_MSG_WARNING(
+        "Component could not be added to the state in the assembler");
     }
   }
 
-  Trk::MultiComponentState mergedState = QuickCloseComponentsMultiStateMerger::merge(
-    std::move(cache.multiComponentState), m_maximumNumberOfComponents);
+  Trk::MultiComponentState mergedState =
+    QuickCloseComponentsMultiStateMerger::merge(
+      std::move(cache.multiComponentState), m_maximumNumberOfComponents);
 
   if (mergedState.empty()) {
     return {};
@@ -238,9 +257,10 @@ Trk::GsfMaterialMixtureConvolution::postUpdate(const Trk::MultiComponentState& m
    ========================================== */
 
 Trk::MultiComponentState
-Trk::GsfMaterialMixtureConvolution::simplifiedMaterialUpdate(const Trk::MultiComponentState& multiComponentState,
-                                                             Trk::PropDirection direction,
-                                                             Trk::ParticleHypothesis particleHypothesis) const
+Trk::GsfMaterialMixtureConvolution::simplifiedMaterialUpdate(
+  const Trk::MultiComponentState& multiComponentState,
+  Trk::PropDirection direction,
+  Trk::ParticleHypothesis particleHypothesis) const
 {
   /* -------------------------------------
      Preliminary checks
@@ -250,24 +270,29 @@ Trk::GsfMaterialMixtureConvolution::simplifiedMaterialUpdate(const Trk::MultiCom
 
   // Check the multi-component state is populated
   if (multiComponentState.empty()) {
-    ATH_MSG_DEBUG("Multi component state passed to extrapolateInsideVolume is not populated... returning 0");
+    ATH_MSG_DEBUG("Multi component state passed to extrapolateInsideVolume is "
+                  "not populated... returning 0");
     return {};
   }
 
   // Hardwired material effects based on approximate material distribution
-  std::unique_ptr<Trk::TrackParameters> combinedState = MultiComponentStateCombiner::combine(multiComponentState);
+  std::unique_ptr<Trk::TrackParameters> combinedState =
+    MultiComponentStateCombiner::combine(multiComponentState);
   const Amg::Vector3D& globalPosition = combinedState->position();
 
   const Trk::MaterialProperties* materialProperties = nullptr;
 
   // Material properties 2.5% X0 - pixels
   if (globalPosition.x() >= 180. && globalPosition.x() < 350.) {
-    materialProperties = new Trk::MaterialProperties(2.34, 93.6, 0.3879, 28.0855, 14, 0.00233);
+    materialProperties =
+      new Trk::MaterialProperties(2.34, 93.6, 0.3879, 28.0855, 14, 0.00233);
   }
 
-  // Material properties 0.75% X0 - SCT ( total for a module = 1.5% - 2 measurement surfaces )
+  // Material properties 0.75% X0 - SCT ( total for a module = 1.5% - 2
+  // measurement surfaces )
   else if (globalPosition.x() >= 350. && globalPosition.x() < 1200.) {
-    materialProperties = new Trk::MaterialProperties(0.702, 93.6, 0.3879, 28.0855, 14, 0.00233);
+    materialProperties =
+      new Trk::MaterialProperties(0.702, 93.6, 0.3879, 28.0855, 14, 0.00233);
   }
 
   if (!materialProperties) {
@@ -285,29 +310,39 @@ Trk::GsfMaterialMixtureConvolution::simplifiedMaterialUpdate(const Trk::MultiCom
     return std::move(*MultiComponentStateHelpers::clone(multiComponentState));
   }
 
-  // Assume tracks normal to detector surface. Approximation resonable for the CTB
+  // Assume tracks normal to detector surface. Approximation resonable for the
+  // CTB
   double pathLength = materialProperties->thickness();
 
   // Loop over all components and perform material effects update separately
-  Trk::MultiComponentState::const_iterator component = multiComponentState.begin();
+  Trk::MultiComponentState::const_iterator component =
+    multiComponentState.begin();
 
   for (; component != multiComponentState.end(); ++component) {
-     Trk::MultiComponentState updatedState =
-      m_updator->updateState(*component, *materialProperties, pathLength, direction, particleHypothesis);
+    Trk::MultiComponentState updatedState =
+      m_updator->updateState(*component,
+                             *materialProperties,
+                             pathLength,
+                             direction,
+                             particleHypothesis);
 
-    if (updatedState.empty())
+    if (updatedState.empty()) {
       continue;
+    }
 
-    bool componentAdded = MultiComponentStateAssembler::addMultiState(cache, std::move(updatedState));
+    bool componentAdded = MultiComponentStateAssembler::addMultiState(
+      cache, std::move(updatedState));
 
     if (!componentAdded) {
-      ATH_MSG_WARNING("Component could not be added to the state in the assembler");
+      ATH_MSG_WARNING(
+        "Component could not be added to the state in the assembler");
     }
 
   } // end loop over components
 
-  Trk::MultiComponentState mergedState = QuickCloseComponentsMultiStateMerger::merge(
-    std::move(cache.multiComponentState), m_maximumNumberOfComponents);
+  Trk::MultiComponentState mergedState =
+    QuickCloseComponentsMultiStateMerger::merge(
+      std::move(cache.multiComponentState), m_maximumNumberOfComponents);
 
   if (mergedState.empty()) {
     return {};
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfMeasurementUpdator.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfMeasurementUpdator.cxx
index 77871ebdd75c94137fde37127ace47dc4893b14d..40148d8932a38d58810d4d78070e41e436043d53 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfMeasurementUpdator.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfMeasurementUpdator.cxx
@@ -34,7 +34,8 @@ Trk::GsfMeasurementUpdator::initialize()
 {
   // Retrieve the updator tool
   if (m_updator.retrieve().isFailure()) {
-    ATH_MSG_FATAL("Could not retrieve measurement updator AlgTool ... Exiting!");
+    ATH_MSG_FATAL(
+      "Could not retrieve measurement updator AlgTool ... Exiting!");
     return StatusCode::FAILURE;
   }
 
@@ -50,44 +51,51 @@ Trk::GsfMeasurementUpdator::finalize()
 }
 
 Trk::MultiComponentState
-Trk::GsfMeasurementUpdator::update(Trk::MultiComponentState&& stateBeforeUpdate,
-                                   const Trk::MeasurementBase& measurement) const
+Trk::GsfMeasurementUpdator::update(
+  Trk::MultiComponentState&& stateBeforeUpdate,
+  const Trk::MeasurementBase& measurement) const
 {
-   MultiComponentState updatedState{};
-  // Point to the correct member function of the linear fitter measurement updator for fitting in
-  // the direction of momentum
+  MultiComponentState updatedState{};
+  // Point to the correct member function of the linear fitter measurement
+  // updator for fitting in the direction of momentum
   Updator updator = &Trk::IUpdator::addToState;
   // Check all components have associated error matricies
   Trk::MultiComponentState::iterator component = stateBeforeUpdate.begin();
   bool rebuildStateWithErrors = false;
-  // Perform initial check of state awaiting update. If all states have associated error matricies
-  // then no need to perform the rebuild
+  // Perform initial check of state awaiting update. If all states have
+  // associated error matricies then no need to perform the rebuild
   for (; component != stateBeforeUpdate.end(); ++component) {
-    rebuildStateWithErrors = rebuildStateWithErrors || invalidComponent(component->first.get());
+    rebuildStateWithErrors =
+      rebuildStateWithErrors || invalidComponent(component->first.get());
   }
 
   if (rebuildStateWithErrors) {
-    Trk::MultiComponentState stateWithInsertedErrors = rebuildState(std::move(stateBeforeUpdate));
+    Trk::MultiComponentState stateWithInsertedErrors =
+      rebuildState(std::move(stateBeforeUpdate));
     // Perform the measurement update with the modified state
-    updatedState = calculateFilterStep(std::move(stateWithInsertedErrors), measurement, updator);
+    updatedState = calculateFilterStep(
+      std::move(stateWithInsertedErrors), measurement, updator);
     return updatedState;
   }
 
   // Perform the measurement update
-  updatedState = calculateFilterStep(std::move(stateBeforeUpdate), measurement, updator);
+  updatedState =
+    calculateFilterStep(std::move(stateBeforeUpdate), measurement, updator);
 
   return updatedState;
 }
 
 Trk::MultiComponentState
-Trk::GsfMeasurementUpdator::getUnbiasedTrackParameters(Trk::MultiComponentState&& stateBeforeUpdate,
-                                                       const MeasurementBase& measurement) const
+Trk::GsfMeasurementUpdator::getUnbiasedTrackParameters(
+  Trk::MultiComponentState&& stateBeforeUpdate,
+  const MeasurementBase& measurement) const
 {
   // Point to the correct member function of the linear fitter measurement
   // updator for fitting in the direction opposite to momentum (smoothing)
   Updator updator = &Trk::IUpdator::removeFromState;
   // Calculate the weight of each state after the measurement
-  return calculateFilterStep(std::move(stateBeforeUpdate), measurement, updator);
+  return calculateFilterStep(
+    std::move(stateBeforeUpdate), measurement, updator);
 }
 
 const Trk::FitQualityOnSurface*
@@ -95,11 +103,12 @@ Trk::GsfMeasurementUpdator::fitQuality(const MultiComponentState& updatedState,
                                        const MeasurementBase& measurement) const
 {
 
-  // Fit quality assumes that a state that has been updated by the measurement updator has been
-  // supplied to it
+  // Fit quality assumes that a state that has been updated by the measurement
+  // updator has been supplied to it
 
   if (updatedState.empty()) {
-    ATH_MSG_WARNING("Attempting to calculate chi2 of a hit with respect to an empty multiple-component state");
+    ATH_MSG_WARNING("Attempting to calculate chi2 of a hit with respect to an "
+                    "empty multiple-component state");
     return nullptr;
   }
 
@@ -110,19 +119,24 @@ Trk::GsfMeasurementUpdator::fitQuality(const MultiComponentState& updatedState,
   for (; component != updatedState.end(); ++component) {
     const Trk::TrackParameters* trackParameters = component->first.get();
 
-    // IUpdator interface change (27/09/2005) to allow for fit quality calculations depending on if
-    // the track parameters incorporate the information contained in the measurement. I ALWAYS do
-    // this - hence the fullStateFitQuality method is used
+    // IUpdator interface change (27/09/2005) to allow for fit quality
+    // calculations depending on if the track parameters incorporate the
+    // information contained in the measurement. I ALWAYS do this - hence the
+    // fullStateFitQuality method is used
     const Trk::FitQualityOnSurface* componentFitQuality =
-      m_updator->fullStateFitQuality(*trackParameters, measurement.localParameters(), measurement.localCovariance());
+      m_updator->fullStateFitQuality(*trackParameters,
+                                     measurement.localParameters(),
+                                     measurement.localCovariance());
 
     double componentChi2 = componentFitQuality->chiSquared();
 
     chi2 += component->second * componentChi2;
 
-    // The same measurement is included in each update so it is the same for each component
-    if (component == updatedState.begin())
+    // The same measurement is included in each update so it is the same for
+    // each component
+    if (component == updatedState.begin()) {
       degreesOfFreedom = componentFitQuality->numberDoF();
+    }
 
     delete componentFitQuality;
   }
@@ -132,15 +146,17 @@ Trk::GsfMeasurementUpdator::fitQuality(const MultiComponentState& updatedState,
     return nullptr;
   }
 
-  const Trk::FitQualityOnSurface* fitQualityOnSurface = new FitQualityOnSurface(chi2, degreesOfFreedom);
+  const Trk::FitQualityOnSurface* fitQualityOnSurface =
+    new FitQualityOnSurface(chi2, degreesOfFreedom);
 
   return fitQualityOnSurface;
 }
 
 Trk::MultiComponentState
-Trk::GsfMeasurementUpdator::calculateFilterStep(Trk::MultiComponentState&& stateBeforeUpdate,
-                                                const Trk::MeasurementBase& measurement,
-                                                const Updator updator) const
+Trk::GsfMeasurementUpdator::calculateFilterStep(
+  Trk::MultiComponentState&& stateBeforeUpdate,
+  const Trk::MeasurementBase& measurement,
+  const Updator updator) const
 {
   // state Assembler cache
   MultiComponentStateAssembler::Cache cache;
@@ -152,27 +168,34 @@ Trk::GsfMeasurementUpdator::calculateFilterStep(Trk::MultiComponentState&& state
 
   // Calculate the weight of each component after the measurement
   PosteriorWeightsCalculator pwc;
-  std::vector<Trk::ComponentParameters> stateWithNewWeights = pwc.weights(std::move(stateBeforeUpdate), measurement);
+  std::vector<Trk::ComponentParameters> stateWithNewWeights =
+    pwc.weights(std::move(stateBeforeUpdate), measurement);
   if (stateWithNewWeights.empty()) {
     ATH_MSG_DEBUG("Cacluation of state posterior weights failed... Exiting!");
     return {};
   }
 
   // Update each component using the specified updator
-  Trk::MultiComponentState::const_iterator component = stateWithNewWeights.begin();
+  Trk::MultiComponentState::const_iterator component =
+    stateWithNewWeights.begin();
 
   for (; component != stateWithNewWeights.end(); ++component) {
 
     Trk::FitQualityOnSurface* fitQuality = nullptr;
 
     // Track updates using a pointer to the member function
-    std::unique_ptr<Trk::TrackParameters> updatedTrackParameters(((&(*m_updator))->*updator)(
-      *(*component).first, measurement.localParameters(), measurement.localCovariance(), fitQuality));
+    std::unique_ptr<Trk::TrackParameters> updatedTrackParameters(
+      ((&(*m_updator))->*updator)(*(*component).first,
+                                  measurement.localParameters(),
+                                  measurement.localCovariance(),
+                                  fitQuality));
 
     if (!updatedTrackParameters) {
-      ATH_MSG_DEBUG("Update of state with Measurement has failed 1... Exiting!");
-      if (fitQuality)
+      ATH_MSG_DEBUG(
+        "Update of state with Measurement has failed 1... Exiting!");
+      if (fitQuality) {
         delete fitQuality;
+      }
       continue;
     }
     if (fitQuality && fitQuality->chiSquared() <= 0.) {
@@ -185,16 +208,21 @@ Trk::GsfMeasurementUpdator::calculateFilterStep(Trk::MultiComponentState&& state
     delete fitQuality;
 
     // Updator does not change the weighting
-    ComponentParameters updatedComponentParameters(std::move(updatedTrackParameters), component->second);
-    // Add component to state being prepared for assembly and check that it is valid
-    bool componentAdded = MultiComponentStateAssembler::addComponent(cache, std::move(updatedComponentParameters));
+    ComponentParameters updatedComponentParameters(
+      std::move(updatedTrackParameters), component->second);
+    // Add component to state being prepared for assembly and check that it is
+    // valid
+    bool componentAdded = MultiComponentStateAssembler::addComponent(
+      cache, std::move(updatedComponentParameters));
 
     if (!componentAdded) {
-      ATH_MSG_DEBUG("Component could not be added to the state in the assembler");
+      ATH_MSG_DEBUG(
+        "Component could not be added to the state in the assembler");
     }
   }
 
-  Trk::MultiComponentState assembledUpdatedState = MultiComponentStateAssembler::assembledState(cache);
+  Trk::MultiComponentState assembledUpdatedState =
+    MultiComponentStateAssembler::assembledState(cache);
 
   if (assembledUpdatedState.empty()) {
     return {};
@@ -205,9 +233,10 @@ Trk::GsfMeasurementUpdator::calculateFilterStep(Trk::MultiComponentState&& state
 }
 
 Trk::MultiComponentState
-Trk::GsfMeasurementUpdator::update(Trk::MultiComponentState&& stateBeforeUpdate,
-                                   const Trk::MeasurementBase& measurement,
-                                   std::unique_ptr<FitQualityOnSurface>& fitQoS) const
+Trk::GsfMeasurementUpdator::update(
+  Trk::MultiComponentState&& stateBeforeUpdate,
+  const Trk::MeasurementBase& measurement,
+  std::unique_ptr<FitQualityOnSurface>& fitQoS) const
 {
 
   Trk::MultiComponentState updatedState{};
@@ -217,16 +246,19 @@ Trk::GsfMeasurementUpdator::update(Trk::MultiComponentState&& stateBeforeUpdate,
 
   bool rebuildStateWithErrors = false;
 
-  // Perform initial check of state awaiting update. If all states have associated error matricies
-  // then no need to perform the rebuild
+  // Perform initial check of state awaiting update. If all states have
+  // associated error matricies then no need to perform the rebuild
   for (; component != stateBeforeUpdate.end(); ++component) {
-    rebuildStateWithErrors = rebuildStateWithErrors || invalidComponent(component->first.get());
+    rebuildStateWithErrors =
+      rebuildStateWithErrors || invalidComponent(component->first.get());
   }
 
   if (rebuildStateWithErrors) {
-    Trk::MultiComponentState stateWithInsertedErrors = rebuildState(std::move(stateBeforeUpdate));
+    Trk::MultiComponentState stateWithInsertedErrors =
+      rebuildState(std::move(stateBeforeUpdate));
     // Perform the measurement update with the modified state
-    updatedState = calculateFilterStep(std::move(stateWithInsertedErrors), measurement, fitQoS);
+    updatedState = calculateFilterStep(
+      std::move(stateWithInsertedErrors), measurement, fitQoS);
     if (updatedState.empty()) {
       ATH_MSG_DEBUG("Updated state could not be calculated... Returning 0");
       fitQoS.reset();
@@ -236,7 +268,8 @@ Trk::GsfMeasurementUpdator::update(Trk::MultiComponentState&& stateBeforeUpdate,
   }
 
   // Perform the measurement update
-  updatedState = calculateFilterStep(std::move(stateBeforeUpdate), measurement, fitQoS);
+  updatedState =
+    calculateFilterStep(std::move(stateBeforeUpdate), measurement, fitQoS);
 
   if (updatedState.empty()) {
     ATH_MSG_DEBUG("Updated state could not be calculated... Returning 0");
@@ -247,9 +280,10 @@ Trk::GsfMeasurementUpdator::update(Trk::MultiComponentState&& stateBeforeUpdate,
 }
 
 Trk::MultiComponentState
-Trk::GsfMeasurementUpdator::calculateFilterStep(Trk::MultiComponentState&& stateBeforeUpdate,
-                                                const Trk::MeasurementBase& measurement,
-                                                std::unique_ptr<FitQualityOnSurface>& fitQoS) const
+Trk::GsfMeasurementUpdator::calculateFilterStep(
+  Trk::MultiComponentState&& stateBeforeUpdate,
+  const Trk::MeasurementBase& measurement,
+  std::unique_ptr<FitQualityOnSurface>& fitQoS) const
 {
   // state Assembler cache
   MultiComponentStateAssembler::Cache cache;
@@ -269,7 +303,8 @@ Trk::GsfMeasurementUpdator::calculateFilterStep(Trk::MultiComponentState&& state
   }
 
   // Update each component using the specified updator
-  Trk::MultiComponentState::const_iterator component = stateWithNewWeights.begin();
+  Trk::MultiComponentState::const_iterator component =
+    stateWithNewWeights.begin();
 
   double chiSquared = 0;
   int degreesOfFreedom = 0;
@@ -277,16 +312,21 @@ Trk::GsfMeasurementUpdator::calculateFilterStep(Trk::MultiComponentState&& state
   for (; component != stateWithNewWeights.end(); ++component) {
 
     if (fabs((*component).first->parameters()[Trk::qOverP]) > 0.033333) {
-      ATH_MSG_DEBUG("About to update component with p<30MeV...skipping component! (2)");
+      ATH_MSG_DEBUG(
+        "About to update component with p<30MeV...skipping component! (2)");
       continue;
     }
     Trk::FitQualityOnSurface* componentFitQuality = nullptr;
     // Track update alternates between update and getUnbiasedTrackParams
-    std::unique_ptr<Trk::TrackParameters> updatedTrackParameters(m_updator->addToState(
-      *(*component).first, measurement.localParameters(), measurement.localCovariance(), componentFitQuality));
+    std::unique_ptr<Trk::TrackParameters> updatedTrackParameters(
+      m_updator->addToState(*(*component).first,
+                            measurement.localParameters(),
+                            measurement.localCovariance(),
+                            componentFitQuality));
 
     if (!updatedTrackParameters) {
-      ATH_MSG_DEBUG("Update of state with Measurement has failed 2... Exiting!");
+      ATH_MSG_DEBUG(
+        "Update of state with Measurement has failed 2... Exiting!");
       if (componentFitQuality) {
         delete componentFitQuality;
       }
@@ -296,10 +336,12 @@ Trk::GsfMeasurementUpdator::calculateFilterStep(Trk::MultiComponentState&& state
     if (invalidComponent(updatedTrackParameters.get())) {
       ATH_MSG_DEBUG("Invalid cov matrix after update... Exiting!");
       if ((*component).first->covariance()) {
-        ATH_MSG_DEBUG("Original has a COV\n " << *(*component).first->covariance());
+        ATH_MSG_DEBUG("Original has a COV\n "
+                      << *(*component).first->covariance());
       }
       if (updatedTrackParameters->covariance()) {
-        ATH_MSG_DEBUG("Result has a COV\n" << *updatedTrackParameters->covariance());
+        ATH_MSG_DEBUG("Result has a COV\n"
+                      << *updatedTrackParameters->covariance());
       }
       updatedTrackParameters.reset();
       delete componentFitQuality;
@@ -316,7 +358,8 @@ Trk::GsfMeasurementUpdator::calculateFilterStep(Trk::MultiComponentState&& state
     double componentChi2 = componentFitQuality->chiSquared();
     chiSquared += component->second * componentChi2;
 
-    // The same measurement is included in each update so it is the same for each component
+    // The same measurement is included in each update so it is the same for
+    // each component
     if (component == stateWithNewWeights.begin()) {
       degreesOfFreedom = componentFitQuality->numberDoF();
     }
@@ -324,16 +367,21 @@ Trk::GsfMeasurementUpdator::calculateFilterStep(Trk::MultiComponentState&& state
     delete componentFitQuality;
 
     // Updator does not change the weighting
-    ComponentParameters updatedComponentParameters(std::move(updatedTrackParameters), component->second);
-    // Add component to state being prepared for assembly and check that it is valid
-    bool componentAdded = MultiComponentStateAssembler::addComponent(cache, std::move(updatedComponentParameters));
+    ComponentParameters updatedComponentParameters(
+      std::move(updatedTrackParameters), component->second);
+    // Add component to state being prepared for assembly and check that it is
+    // valid
+    bool componentAdded = MultiComponentStateAssembler::addComponent(
+      cache, std::move(updatedComponentParameters));
 
     if (!componentAdded) {
-      ATH_MSG_DEBUG("Component could not be added to the state in the assembler");
+      ATH_MSG_DEBUG(
+        "Component could not be added to the state in the assembler");
     }
   }
 
-  Trk::MultiComponentState assembledUpdatedState = MultiComponentStateAssembler::assembledState(cache);
+  Trk::MultiComponentState assembledUpdatedState =
+    MultiComponentStateAssembler::assembledState(cache);
 
   if (assembledUpdatedState.empty()) {
     return {};
@@ -346,7 +394,8 @@ Trk::GsfMeasurementUpdator::calculateFilterStep(Trk::MultiComponentState&& state
 }
 
 bool
-Trk::GsfMeasurementUpdator::invalidComponent(const Trk::TrackParameters* trackParameters) const
+Trk::GsfMeasurementUpdator::invalidComponent(
+  const Trk::TrackParameters* trackParameters) const
 {
   auto measuredCov = trackParameters->covariance();
   bool rebuildCov = false;
@@ -354,15 +403,17 @@ Trk::GsfMeasurementUpdator::invalidComponent(const Trk::TrackParameters* trackPa
     rebuildCov = true;
   } else {
     for (int i(0); i < 5; ++i) {
-      if ((*measuredCov)(i, i) <= 0.)
+      if ((*measuredCov)(i, i) <= 0.) {
         rebuildCov = true;
+      }
     }
   }
   return rebuildCov;
 }
 
 Trk::MultiComponentState
-Trk::GsfMeasurementUpdator::rebuildState(Trk::MultiComponentState&& stateBeforeUpdate) const
+Trk::GsfMeasurementUpdator::rebuildState(
+  Trk::MultiComponentState&& stateBeforeUpdate) const
 {
   Trk::MultiComponentState stateWithInsertedErrors{};
 
@@ -383,8 +434,14 @@ Trk::GsfMeasurementUpdator::rebuildState(Trk::MultiComponentState&& stateBeforeU
       (*bigNewCovarianceMatrix)(4, 4) = 0.001 * 0.001;
 
       AmgVector(5) par = trackParameters->parameters();
-      Trk::TrackParameters* trackParametersWithError = trackParameters->associatedSurface().createTrackParameters(
-        par[Trk::loc1], par[Trk::loc2], par[Trk::phi], par[Trk::theta], par[Trk::qOverP], bigNewCovarianceMatrix);
+      Trk::TrackParameters* trackParametersWithError =
+        trackParameters->associatedSurface().createTrackParameters(
+          par[Trk::loc1],
+          par[Trk::loc2],
+          par[Trk::phi],
+          par[Trk::theta],
+          par[Trk::qOverP],
+          bigNewCovarianceMatrix);
       stateWithInsertedErrors.emplace_back(trackParametersWithError, weight);
     } else {
       stateWithInsertedErrors.push_back(std::move(*component));
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfSmoother.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfSmoother.cxx
index 863e82d32e7f345b49f96b8027b04a5f5df33923..af2de668dc091b6c29eea1524c9ebbd093f853b8 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfSmoother.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/GsfSmoother.cxx
@@ -9,7 +9,8 @@ begin                : Wednesday 9th March 2005
 author               : atkinson
 email                : Tom.Atkinson@cern.ch
 decription           : Implementation code for the class GsfSmoother
-********************************************************************************** */
+**********************************************************************************
+*/
 
 #include "TrkGaussianSumFilter/GsfSmoother.h"
 
@@ -22,13 +23,15 @@ decription           : Implementation code for the class GsfSmoother
 #include "TrkPseudoMeasurementOnTrack/PseudoMeasurementOnTrack.h"
 #include "TrkSurfaces/Surface.h"
 
-#include "TrkMultiComponentStateOnSurface/MultiComponentStateOnSurface.h"
-#include "TrkGaussianSumFilter/QuickCloseComponentsMultiStateMerger.h"
 #include "TrkGaussianSumFilter/IMultiStateExtrapolator.h"
 #include "TrkGaussianSumFilter/IMultiStateMeasurementUpdator.h"
 #include "TrkGaussianSumFilter/MultiComponentStateCombiner.h"
+#include "TrkGaussianSumFilter/QuickCloseComponentsMultiStateMerger.h"
+#include "TrkMultiComponentStateOnSurface/MultiComponentStateOnSurface.h"
 
-Trk::GsfSmoother::GsfSmoother(const std::string& type, const std::string& name, const IInterface* parent)
+Trk::GsfSmoother::GsfSmoother(const std::string& type,
+                              const std::string& name,
+                              const IInterface* parent)
   : AthAlgTool(type, name, parent)
   , m_combineWithFitter(false)
 {
@@ -50,8 +53,9 @@ Trk::GsfSmoother::finalize()
 }
 
 StatusCode
-Trk::GsfSmoother::configureTools(const ToolHandle<IMultiStateExtrapolator>& extrapolator,
-                                 const ToolHandle<IMultiStateMeasurementUpdator>& measurementUpdator)
+Trk::GsfSmoother::configureTools(
+  const ToolHandle<IMultiStateExtrapolator>& extrapolator,
+  const ToolHandle<IMultiStateMeasurementUpdator>& measurementUpdator)
 {
   m_extrapolator = extrapolator;
   m_updator = measurementUpdator;
@@ -75,14 +79,15 @@ Trk::GsfSmoother::fit(const ForwardTrajectory& forwardTrajectory,
   }
   // Check that the forward trajectory is filled
   if (forwardTrajectory.empty()) {
-    ATH_MSG_ERROR("Attempting to smooth an empty forward trajectory... Exiting!");
+    ATH_MSG_ERROR(
+      "Attempting to smooth an empty forward trajectory... Exiting!");
     return nullptr;
   }
 
-  /* Instansiate the return trajectory. This is a vectory of TrackStateOnSurface object
-     In the GSF Smoother these TrackStateOnSurface objects are the base class for the
-     MultiComponentStateOnSurface. This memory should be freed by the fitter / smoother master
-     method */
+  /* Instansiate the return trajectory. This is a vectory of TrackStateOnSurface
+     object In the GSF Smoother these TrackStateOnSurface objects are the base
+     class for the MultiComponentStateOnSurface. This memory should be freed by
+     the fitter / smoother master method */
 
   /*
    * In general for things we want to control their lifetime locally
@@ -93,34 +98,41 @@ Trk::GsfSmoother::fit(const ForwardTrajectory& forwardTrajectory,
    * We control the lifetime of these so unique_ptr
    */
   auto smoothedTrajectory = std::make_unique<Trk::SmoothedTrajectory>();
-  auto smootherPredictionMultiState = std::make_unique<Trk::MultiComponentState>();
+  auto smootherPredictionMultiState =
+    std::make_unique<Trk::MultiComponentState>();
   /*
-   * Get the initial smoother prediction. It is the last prediction in the forwards trajectory
+   * Get the initial smoother prediction. It is the last prediction in the
+   * forwards trajectory
    */
   /* these can be  owned by the input so const ptr*/
-  const Trk::TrackStateOnSurface* smootherPredictionStateOnSurface = forwardTrajectory.back();
+  const Trk::TrackStateOnSurface* smootherPredictionStateOnSurface =
+    forwardTrajectory.back();
   /*
    * We can have single or Multi components here, so we choose what to clone
    */
-  const Trk::MultiComponentStateOnSurface* smootherPredictionMultiStateOnSurface =
-    dynamic_cast<const Trk::MultiComponentStateOnSurface*>(smootherPredictionStateOnSurface);
+  const Trk::MultiComponentStateOnSurface*
+    smootherPredictionMultiStateOnSurface =
+      dynamic_cast<const Trk::MultiComponentStateOnSurface*>(
+        smootherPredictionStateOnSurface);
 
   if (!smootherPredictionMultiStateOnSurface) {
-    ATH_MSG_DEBUG("GSF smoother has a single component state as starting point");
+    ATH_MSG_DEBUG(
+      "GSF smoother has a single component state as starting point");
     auto dummyMultiState = std::make_unique<Trk::MultiComponentState>();
-    Trk::ComponentParameters dummyParams(smootherPredictionStateOnSurface->trackParameters()->clone(), 1.0);
+    Trk::ComponentParameters dummyParams(
+      smootherPredictionStateOnSurface->trackParameters()->clone(), 1.0);
     dummyMultiState->push_back(std::move(dummyParams));
     smootherPredictionMultiState = std::move(dummyMultiState);
   } else {
-    smootherPredictionMultiState =
-      MultiComponentStateHelpers::clone(*(smootherPredictionMultiStateOnSurface->components()));
+    smootherPredictionMultiState = MultiComponentStateHelpers::clone(
+      *(smootherPredictionMultiStateOnSurface->components()));
   }
 
   /*
    * Perform the measurement update
-   * The first smoother prediction state is equivalent to the last forwards prediction
-   * updated with the last measurement
-   * Retrieve the first MeasurementBase object for the smoother
+   * The first smoother prediction state is equivalent to the last forwards
+   * prediction updated with the last measurement Retrieve the first
+   * MeasurementBase object for the smoother
    */
 
   std::unique_ptr<Trk::FitQualityOnSurface> fitQuality;
@@ -134,12 +146,15 @@ Trk::GsfSmoother::fit(const ForwardTrajectory& forwardTrajectory,
   const Trk::MeasurementBase* firstSmootherMeasurementOnTrack =
     smootherPredictionStateOnSurface->measurementOnTrack()->clone();
   if (!firstSmootherMeasurementOnTrack) {
-    ATH_MSG_WARNING("Initial state on surface in smoother does not have an associated "
-                    "MeasurementBase object... returning 0");
+    ATH_MSG_WARNING(
+      "Initial state on surface in smoother does not have an associated "
+      "MeasurementBase object... returning 0");
     return nullptr;
   }
   Trk::MultiComponentState firstSmoothedState =
-    m_updator->update(std::move(*smootherPredictionMultiState), *firstSmootherMeasurementOnTrack, fitQuality);
+    m_updator->update(std::move(*smootherPredictionMultiState),
+                      *firstSmootherMeasurementOnTrack,
+                      fitQuality);
 
   if (firstSmoothedState.empty()) {
     ATH_MSG_DEBUG("First GSF smoothing update failed... Exiting!");
@@ -151,11 +166,12 @@ Trk::GsfSmoother::fit(const ForwardTrajectory& forwardTrajectory,
   std::unique_ptr<Trk::TrackParameters> combinedFirstSmoothedState =
     MultiComponentStateCombiner::combine(firstSmoothedState, true);
   /*owned be the tragectory*/
-  const Trk::MultiComponentStateOnSurface* updatedStateOnSurface = new MultiComponentStateOnSurface(
-    firstSmootherMeasurementOnTrack, 
-    combinedFirstSmoothedState.release(), 
-    MultiComponentStateHelpers::clone(firstSmoothedState).release(), 
-    fitQuality.release());
+  const Trk::MultiComponentStateOnSurface* updatedStateOnSurface =
+    new MultiComponentStateOnSurface(
+      firstSmootherMeasurementOnTrack,
+      combinedFirstSmoothedState.release(),
+      MultiComponentStateHelpers::clone(firstSmoothedState).release(),
+      fitQuality.release());
   smoothedTrajectory->push_back(updatedStateOnSurface);
   /*
    * Reset ptr
@@ -170,24 +186,29 @@ Trk::GsfSmoother::fit(const ForwardTrajectory& forwardTrajectory,
   smootherPredictionMultiState.reset();
 
   if (!MultiComponentStateHelpers::isMeasured(firstSmoothedState)) {
-    ATH_MSG_WARNING("Updated state is not measured. Rejecting smoothed state... returning 0");
+    ATH_MSG_WARNING(
+      "Updated state is not measured. Rejecting smoothed state... returning 0");
     return nullptr;
   }
   /*
-   * Generate prediction by scaling the covariance of all components in the initial state
+   * Generate prediction by scaling the covariance of all components in the
+   * initial state
    *
-   * Generate a large prediction for extrapolation. This way there is no dependance on error of
-   * prediction NB local Y and theta are not blown out too much to help in the TRT
+   * Generate a large prediction for extrapolation. This way there is no
+   * dependance on error of prediction NB local Y and theta are not blown out
+   * too much to help in the TRT
    */
   std::unique_ptr<Trk::MultiComponentState> smoothedStateWithScaledError =
-    MultiComponentStateHelpers::cloneWithScaledError(firstSmoothedState, 15., 5., 15., 5., 15.);
+    MultiComponentStateHelpers::cloneWithScaledError(
+      firstSmoothedState, 15., 5., 15., 5., 15.);
 
   // Perform a measurement update on this new state
-  Trk::MultiComponentState updatedState =
-    m_updator->update(std::move(*smoothedStateWithScaledError), *firstSmootherMeasurementOnTrack);
+  Trk::MultiComponentState updatedState = m_updator->update(
+    std::move(*smoothedStateWithScaledError), *firstSmootherMeasurementOnTrack);
 
   if (updatedState.empty()) {
-    ATH_MSG_WARNING("Smoother prediction could not be determined... returning 0");
+    ATH_MSG_WARNING(
+      "Smoother prediction could not be determined... returning 0");
     return nullptr;
   }
 
@@ -195,20 +216,27 @@ Trk::GsfSmoother::fit(const ForwardTrajectory& forwardTrajectory,
   firstSmootherMeasurementOnTrack = nullptr;
 
   // =============================================================================
-  // Loop over all remaining TrackStateOnSurface objects in the forward trajectory
+  // Loop over all remaining TrackStateOnSurface objects in the forward
+  // trajectory
   // =============================================================================
 
-  Trk::ForwardTrajectory::const_reverse_iterator trackStateOnSurface = forwardTrajectory.rbegin() + 1;
-  Trk::ForwardTrajectory::const_reverse_iterator lasttrackStateOnSurface = forwardTrajectory.rend() - 1;
-  // TSOS that the cluster measuremenet will added on after .. can’t be teh last as the impact
-  // parameters will be compromised
-  Trk::ForwardTrajectory::const_reverse_iterator secondLastTrackStateOnSurface = forwardTrajectory.rend() - 2;
-
-  for (; trackStateOnSurface != forwardTrajectory.rend(); ++trackStateOnSurface) {
+  Trk::ForwardTrajectory::const_reverse_iterator trackStateOnSurface =
+    forwardTrajectory.rbegin() + 1;
+  Trk::ForwardTrajectory::const_reverse_iterator lasttrackStateOnSurface =
+    forwardTrajectory.rend() - 1;
+  // TSOS that the cluster measuremenet will added on after .. can’t be teh last
+  // as the impact parameters will be compromised
+  Trk::ForwardTrajectory::const_reverse_iterator secondLastTrackStateOnSurface =
+    forwardTrajectory.rend() - 2;
+
+  for (; trackStateOnSurface != forwardTrajectory.rend();
+       ++trackStateOnSurface) {
     // Retrieve the MeasurementBase object from the TrackStateOnSurface object
-    const Trk::MeasurementBase* measurement_in = (*trackStateOnSurface)->measurementOnTrack();
+    const Trk::MeasurementBase* measurement_in =
+      (*trackStateOnSurface)->measurementOnTrack();
     if (!measurement_in) {
-      ATH_MSG_WARNING("MeasurementBase object could not be extracted from a measurement... continuing");
+      ATH_MSG_WARNING("MeasurementBase object could not be extracted from a "
+                      "measurement... continuing");
       continue;
     }
     // Clone the MeasurementBase object
@@ -227,7 +255,8 @@ Trk::GsfSmoother::fit(const ForwardTrajectory& forwardTrajectory,
                                   particleHypothesis);
 
     if (extrapolatedState.empty()) {
-      ATH_MSG_DEBUG("Extrapolation to measurement surface failed... rejecting track!");
+      ATH_MSG_DEBUG(
+        "Extrapolation to measurement surface failed... rejecting track!");
       return nullptr;
     }
 
@@ -235,23 +264,27 @@ Trk::GsfSmoother::fit(const ForwardTrajectory& forwardTrajectory,
     if (!(*trackStateOnSurface)->type(TrackStateOnSurface::Measurement)) {
       updatedState = std::move(extrapolatedState);
 
-      std::bitset<TrackStateOnSurface::NumberOfTrackStateOnSurfaceTypes> type(0);
+      std::bitset<TrackStateOnSurface::NumberOfTrackStateOnSurfaceTypes> type(
+        0);
       type.set(TrackStateOnSurface::Outlier);
 
       Trk::MultiComponentStateOnSurface* updatedStateOnSurface =
-        new Trk::MultiComponentStateOnSurface(measurement.release(),
-                                              MultiComponentStateHelpers::clone(updatedState).release(),
-                                              new FitQuality(1, 1),
-                                              nullptr,
-                                              type);
+        new Trk::MultiComponentStateOnSurface(
+          measurement.release(),
+          MultiComponentStateHelpers::clone(updatedState).release(),
+          new FitQuality(1, 1),
+          nullptr,
+          type);
       smoothedTrajectory->push_back(updatedStateOnSurface);
       continue;
     }
 
     // Update newly extrapolated state with MeasurementBase measurement
-    updatedState = m_updator->update(std::move(extrapolatedState), *measurement, fitQuality);
+    updatedState =
+      m_updator->update(std::move(extrapolatedState), *measurement, fitQuality);
     if (updatedState.empty()) {
-      ATH_MSG_WARNING("Could not update the multi-component state... rejecting track!");
+      ATH_MSG_WARNING(
+        "Could not update the multi-component state... rejecting track!");
       return nullptr;
     }
 
@@ -265,29 +298,39 @@ Trk::GsfSmoother::fit(const ForwardTrajectory& forwardTrajectory,
       std::unique_ptr<Trk::MultiComponentState> forwardsMultiStateOwn;
 
       const Trk::MultiComponentStateOnSurface* forwardsMultiStateOnSurface =
-        dynamic_cast<const Trk::MultiComponentStateOnSurface*>(*trackStateOnSurface);
+        dynamic_cast<const Trk::MultiComponentStateOnSurface*>(
+          *trackStateOnSurface);
 
       if (!forwardsMultiStateOnSurface) {
         // Create new multiComponentState from single state
-        Trk::ComponentParameters componentParameters((*trackStateOnSurface)->trackParameters()->clone(), 1.);
+        Trk::ComponentParameters componentParameters(
+          (*trackStateOnSurface)->trackParameters()->clone(), 1.);
         forwardsMultiStateOwn = std::make_unique<Trk::MultiComponentState>();
         forwardsMultiStateOwn->push_back(std::move(componentParameters));
         forwardsMultiState = forwardsMultiStateOwn.get();
       } else {
         forwardsMultiState = forwardsMultiStateOnSurface->components();
       }
-      Trk::MultiComponentState combinedState2 = combine(*forwardsMultiState, updatedState);
+      Trk::MultiComponentState combinedState2 =
+        combine(*forwardsMultiState, updatedState);
       if (combinedState2.empty()) {
-        ATH_MSG_WARNING("Could not combine state from forward fit with smoother state... rejecting track!");
+        ATH_MSG_WARNING("Could not combine state from forward fit with "
+                        "smoother state... rejecting track!");
         return nullptr;
       }
-      const Trk::FitQualityOnSurface* combinedFitQuality = m_updator->fitQuality(combinedState2, *measurement);
-      // In the case of combination with forwards state - push back the combined state
-      const Trk::MultiComponentStateOnSurface* combinedStateOnSurface = new MultiComponentStateOnSurface(
-        measurement.release(), MultiComponentStateHelpers::clone(combinedState2).release(), combinedFitQuality);
+      const Trk::FitQualityOnSurface* combinedFitQuality =
+        m_updator->fitQuality(combinedState2, *measurement);
+      // In the case of combination with forwards state - push back the combined
+      // state
+      const Trk::MultiComponentStateOnSurface* combinedStateOnSurface =
+        new MultiComponentStateOnSurface(
+          measurement.release(),
+          MultiComponentStateHelpers::clone(combinedState2).release(),
+          combinedFitQuality);
       smoothedTrajectory->push_back(combinedStateOnSurface);
     } else {
-      // If combination with forwards state is not done - push back updated state
+      // If combination with forwards state is not done - push back updated
+      // state
       const Trk::MultiComponentStateOnSurface* updatedStateOnSurface = nullptr;
 
       if (trackStateOnSurface == lasttrackStateOnSurface) {
@@ -295,18 +338,22 @@ Trk::GsfSmoother::fit(const ForwardTrajectory& forwardTrajectory,
           MultiComponentStateCombiner::combine(updatedState, true);
 
         if (combinedLastState) {
-          updatedStateOnSurface =
-            new Trk::MultiComponentStateOnSurface(measurement.release(),
-                                                  combinedLastState.release(),
-                                                  MultiComponentStateHelpers::clone(updatedState).release(),
-                                                  fitQuality.release());
+          updatedStateOnSurface = new Trk::MultiComponentStateOnSurface(
+            measurement.release(),
+            combinedLastState.release(),
+            MultiComponentStateHelpers::clone(updatedState).release(),
+            fitQuality.release());
         } else {
           updatedStateOnSurface = new Trk::MultiComponentStateOnSurface(
-            measurement.release(), MultiComponentStateHelpers::clone(updatedState).release(), fitQuality.release());
+            measurement.release(),
+            MultiComponentStateHelpers::clone(updatedState).release(),
+            fitQuality.release());
         }
       } else {
         updatedStateOnSurface = new Trk::MultiComponentStateOnSurface(
-          measurement.release(), MultiComponentStateHelpers::clone(updatedState).release(), fitQuality.release());
+          measurement.release(),
+          MultiComponentStateHelpers::clone(updatedState).release(),
+          fitQuality.release());
       }
 
       smoothedTrajectory->push_back(updatedStateOnSurface);
@@ -317,7 +364,8 @@ Trk::GsfSmoother::fit(const ForwardTrajectory& forwardTrajectory,
 
       if (ccot && trackStateOnSurface == secondLastTrackStateOnSurface) {
 
-        Trk::MultiComponentState ccotState = addCCOT(updatedStateOnSurface, ccot, smoothedTrajectory.get());
+        Trk::MultiComponentState ccotState =
+          addCCOT(updatedStateOnSurface, ccot, smoothedTrajectory.get());
         if (!ccotState.empty()) {
           updatedState = std::move(ccotState);
         }
@@ -328,18 +376,21 @@ Trk::GsfSmoother::fit(const ForwardTrajectory& forwardTrajectory,
 }
 
 Trk::MultiComponentState
-Trk::GsfSmoother::combine(const Trk::MultiComponentState& forwardsMultiState,
-                          const Trk::MultiComponentState& smootherMultiState) const
+Trk::GsfSmoother::combine(
+  const Trk::MultiComponentState& forwardsMultiState,
+  const Trk::MultiComponentState& smootherMultiState) const
 {
 
-  std::unique_ptr<Trk::MultiComponentState> combinedMultiState = std::make_unique<MultiComponentState>();
+  std::unique_ptr<Trk::MultiComponentState> combinedMultiState =
+    std::make_unique<MultiComponentState>();
   /* ================================================
      Loop over all components in forwards multi-state
      ================================================ */
 
   for (auto& forwardsComponent : forwardsMultiState) {
     // Need to check that all components have associated weight matricies
-    const AmgSymMatrix(5)* forwardMeasuredCov = forwardsComponent.first->covariance();
+    const AmgSymMatrix(5)* forwardMeasuredCov =
+      forwardsComponent.first->covariance();
 
     /* ====================================================
        Loop over all components in the smoother multi-state
@@ -347,58 +398,74 @@ Trk::GsfSmoother::combine(const Trk::MultiComponentState& forwardsMultiState,
 
     for (auto& smootherComponent : smootherMultiState) {
       // Need to check that all components have associated weight matricies
-      const AmgSymMatrix(5)* smootherMeasuredCov = smootherComponent.first->covariance();
+      const AmgSymMatrix(5)* smootherMeasuredCov =
+        smootherComponent.first->covariance();
       if (!smootherMeasuredCov && !forwardMeasuredCov) {
-        ATH_MSG_WARNING("Cannot combine two components both without associated errors... returning 0");
+        ATH_MSG_WARNING("Cannot combine two components both without associated "
+                        "errors... returning 0");
         return {};
       }
 
       if (!forwardMeasuredCov) {
-        Trk::ComponentParameters smootherComponentOnly(smootherComponent.first->clone(), smootherComponent.second);
+        Trk::ComponentParameters smootherComponentOnly(
+          smootherComponent.first->clone(), smootherComponent.second);
         combinedMultiState->push_back(std::move(smootherComponentOnly));
         continue;
       }
 
       if (!smootherMeasuredCov) {
-        Trk::ComponentParameters forwardComponentOnly(forwardsComponent.first->clone(), forwardsComponent.second);
+        Trk::ComponentParameters forwardComponentOnly(
+          forwardsComponent.first->clone(), forwardsComponent.second);
         combinedMultiState->push_back(std::move(forwardComponentOnly));
         continue;
       }
 
-      const AmgSymMatrix(5) summedCovariance = *forwardMeasuredCov + *smootherMeasuredCov;
-      const AmgSymMatrix(5) K = *forwardMeasuredCov * summedCovariance.inverse();
+      const AmgSymMatrix(5) summedCovariance =
+        *forwardMeasuredCov + *smootherMeasuredCov;
+      const AmgSymMatrix(5) K =
+        *forwardMeasuredCov * summedCovariance.inverse();
       const Amg::VectorX newParameters =
         forwardsComponent.first->parameters() +
-        K * (smootherComponent.first->parameters() - forwardsComponent.first->parameters());
-      const Amg::VectorX parametersDiff = forwardsComponent.first->parameters() - smootherComponent.first->parameters();
-
-      AmgSymMatrix(5)* covarianceOfNewParameters = new AmgSymMatrix(5)(K * *smootherMeasuredCov);
-
-      Trk::TrackParameters* combinedTrackParameters = (forwardsComponent.first)
-                                                        ->associatedSurface()
-                                                        .createTrackParameters(newParameters[Trk::loc1],
-                                                                               newParameters[Trk::loc2],
-                                                                               newParameters[Trk::phi],
-                                                                               newParameters[Trk::theta],
-                                                                               newParameters[Trk::qOverP],
-                                                                               covarianceOfNewParameters);
-      // Covariance matrix object now owned by TrackParameters object. Reset pointer to prevent
-      // delete
+        K * (smootherComponent.first->parameters() -
+             forwardsComponent.first->parameters());
+      const Amg::VectorX parametersDiff =
+        forwardsComponent.first->parameters() -
+        smootherComponent.first->parameters();
+
+      AmgSymMatrix(5)* covarianceOfNewParameters =
+        new AmgSymMatrix(5)(K * *smootherMeasuredCov);
+
+      Trk::TrackParameters* combinedTrackParameters =
+        (forwardsComponent.first)
+          ->associatedSurface()
+          .createTrackParameters(newParameters[Trk::loc1],
+                                 newParameters[Trk::loc2],
+                                 newParameters[Trk::phi],
+                                 newParameters[Trk::theta],
+                                 newParameters[Trk::qOverP],
+                                 covarianceOfNewParameters);
+      // Covariance matrix object now owned by TrackParameters object. Reset
+      // pointer to prevent delete
       covarianceOfNewParameters = nullptr;
-      const AmgSymMatrix(5) invertedSummedCovariance = summedCovariance.inverse();
-      // Determine the scaling factor for the new weighting. Determined from the PDF of the
-      // many-dimensional gaussian
-      double exponent = parametersDiff.transpose() * invertedSummedCovariance * parametersDiff;
+      const AmgSymMatrix(5) invertedSummedCovariance =
+        summedCovariance.inverse();
+      // Determine the scaling factor for the new weighting. Determined from the
+      // PDF of the many-dimensional gaussian
+      double exponent =
+        parametersDiff.transpose() * invertedSummedCovariance * parametersDiff;
       double weightScalingFactor = exp(-0.5 * exponent);
-      double combinedWeight = smootherComponent.second * forwardsComponent.second * weightScalingFactor;
-      Trk::ComponentParameters combinedComponent(combinedTrackParameters, combinedWeight);
+      double combinedWeight = smootherComponent.second *
+                              forwardsComponent.second * weightScalingFactor;
+      Trk::ComponentParameters combinedComponent(combinedTrackParameters,
+                                                 combinedWeight);
       combinedMultiState->push_back(std::move(combinedComponent));
     }
   }
 
   // Component reduction on the combined state
-   Trk::MultiComponentState mergedState = QuickCloseComponentsMultiStateMerger::merge(
-    std::move(*combinedMultiState), m_maximumNumberOfComponents);
+  Trk::MultiComponentState mergedState =
+    QuickCloseComponentsMultiStateMerger::merge(std::move(*combinedMultiState),
+                                                m_maximumNumberOfComponents);
 
   // Before return the weights of the states need to be renormalised to one.
   MultiComponentStateHelpers::renormaliseState(mergedState);
@@ -417,7 +484,8 @@ Trk::GsfSmoother::addCCOT(const Trk::TrackStateOnSurface* currentState,
     return {};
   }
 
-  const Trk::MultiComponentState* currentMultiComponentState = currentMultiStateOS->components();
+  const Trk::MultiComponentState* currentMultiComponentState =
+    currentMultiStateOS->components();
   const Trk::MeasurementBase* measurement = currentState->measurementOnTrack();
   const Trk::Surface* currentSurface(nullptr);
 
@@ -427,49 +495,59 @@ Trk::GsfSmoother::addCCOT(const Trk::TrackStateOnSurface* currentState,
   Trk::MultiComponentState extrapolatedState{};
   // Extrapolate to the Calo
   if (currentSurface) {
-    extrapolatedState = m_extrapolator->extrapolateDirectly(Gaudi::Hive::currentContext(),
-                                                            *currentMultiComponentState,
-                                                            ccot->associatedSurface(),
-                                                            Trk::alongMomentum,
-                                                            false,
-                                                            Trk::nonInteracting);
+    extrapolatedState =
+      m_extrapolator->extrapolateDirectly(Gaudi::Hive::currentContext(),
+                                          *currentMultiComponentState,
+                                          ccot->associatedSurface(),
+                                          Trk::alongMomentum,
+                                          false,
+                                          Trk::nonInteracting);
   }
 
   // Extrapolation Failed continue
   if (extrapolatedState.empty()) {
-    ATH_MSG_DEBUG("Extrapolation to the CCOT failed .. now not being taken in account");
+    ATH_MSG_DEBUG(
+      "Extrapolation to the CCOT failed .. now not being taken in account");
     return {};
   }
   // Update newly extrapolated state with MeasurementBase measurement
   std::unique_ptr<Trk::FitQualityOnSurface> fitQuality;
-  Trk::MultiComponentState updatedState = m_updator->update(std::move(extrapolatedState), *ccot, fitQuality);
+  Trk::MultiComponentState updatedState =
+    m_updator->update(std::move(extrapolatedState), *ccot, fitQuality);
 
   if (updatedState.empty()) {
-    ATH_MSG_DEBUG("Update of extrapolated state with CCOT failed .. now not being taken in account");
+    ATH_MSG_DEBUG("Update of extrapolated state with CCOT failed .. now not "
+                  "being taken in account");
     return {};
   }
 
   // Build TSOS with CCOT at the surface of the surface of calo
-  Trk::MultiComponentStateOnSurface* updatedMCSOS = new Trk::MultiComponentStateOnSurface(
-    ccot->clone(), MultiComponentStateHelpers::clone(updatedState).release(), fitQuality.release());
+  Trk::MultiComponentStateOnSurface* updatedMCSOS =
+    new Trk::MultiComponentStateOnSurface(
+      ccot->clone(),
+      MultiComponentStateHelpers::clone(updatedState).release(),
+      fitQuality.release());
 
   // Extrapolate back to the surface nearest the origin
-  extrapolatedState = m_extrapolator->extrapolateDirectly(Gaudi::Hive::currentContext(),
-                                                          updatedState,
-                                                          *currentSurface,
-                                                          Trk::oppositeMomentum,
-                                                          false,
-                                                          Trk::nonInteracting);
+  extrapolatedState =
+    m_extrapolator->extrapolateDirectly(Gaudi::Hive::currentContext(),
+                                        updatedState,
+                                        *currentSurface,
+                                        Trk::oppositeMomentum,
+                                        false,
+                                        Trk::nonInteracting);
 
   if (extrapolatedState.empty()) {
-    ATH_MSG_DEBUG("Extrapolation from CCOT to 1st measurement failed .. now not being taken in account");
+    ATH_MSG_DEBUG("Extrapolation from CCOT to 1st measurement failed .. now "
+                  "not being taken in account");
     delete updatedMCSOS;
     return {};
   }
 
-  // Now build a dummy measurement ....  we dont want to a double count the measurement but
-  // we need to extrapolate back to origin to allow for the perigee parameters to be estimated
-  // Note this only important if the track is refit otherwise it has no influence.
+  // Now build a dummy measurement ....  we dont want to a double count the
+  // measurement but we need to extrapolate back to origin to allow for the
+  // perigee parameters to be estimated Note this only important if the track is
+  // refit otherwise it has no influence.
   AmgSymMatrix(5) covMatrix;
   covMatrix.setZero();
   covMatrix(0, 0) = 1e6;
@@ -479,19 +557,23 @@ Trk::GsfSmoother::addCCOT(const Trk::TrackStateOnSurface* currentState,
   defPar.push_back(locX);
   Trk::LocalParameters locpars(defPar);
 
-  Trk::PseudoMeasurementOnTrack* pseudoMeasurement = new PseudoMeasurementOnTrack(locpars, covMatrix, *currentSurface);
+  Trk::PseudoMeasurementOnTrack* pseudoMeasurement =
+    new PseudoMeasurementOnTrack(locpars, covMatrix, *currentSurface);
 
   //  Combine the state using and find the mode of the distribution
-  std::unique_ptr<Trk::TrackParameters> combinedState = MultiComponentStateCombiner::combine(extrapolatedState, true);
+  std::unique_ptr<Trk::TrackParameters> combinedState =
+    MultiComponentStateCombiner::combine(extrapolatedState, true);
 
-  const Trk::FitQualityOnSurface* combinedFitQuality = m_updator->fitQuality(extrapolatedState, *ccot);
+  const Trk::FitQualityOnSurface* combinedFitQuality =
+    m_updator->fitQuality(extrapolatedState, *ccot);
 
   // Build a TSOS using the dummy measurement and combined state
   Trk::MultiComponentStateOnSurface* finalSOS =
-    new Trk::MultiComponentStateOnSurface(pseudoMeasurement,
-                                          combinedState.release(),
-                                          MultiComponentStateHelpers::clone(extrapolatedState).release(),
-                                          combinedFitQuality);
+    new Trk::MultiComponentStateOnSurface(
+      pseudoMeasurement,
+      combinedState.release(),
+      MultiComponentStateHelpers::clone(extrapolatedState).release(),
+      combinedFitQuality);
   smoothedTrajectory->push_back(updatedMCSOS);
   smoothedTrajectory->push_back(finalSOS);
   ATH_MSG_DEBUG("Successfully added CCOT ");
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/KLGaussianMixtureReduction.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/KLGaussianMixtureReduction.cxx
index 47e78775b2304e9171f4ff2b473351fb255b3c5e..471707c49baf44e4509d9367d0214768845cef83 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/KLGaussianMixtureReduction.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/KLGaussianMixtureReduction.cxx
@@ -2,9 +2,9 @@
   Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 */
 #include "TrkGaussianSumFilter/KLGaussianMixtureReduction.h"
-#include "TrkGaussianSumFilter/AlignedDynArray.h"
 #include "CxxUtils/features.h"
 #include "CxxUtils/vectorize.h"
+#include "TrkGaussianSumFilter/AlignedDynArray.h"
 #include <limits>
 #if !defined(__GNUC__)
 #define __builtin_assume_aligned(X, N) X
@@ -16,25 +16,23 @@
 #endif
 #endif
 
-//This enables -ftree-vectorize in gcc (we compile with O2)
+// This enables -ftree-vectorize in gcc (we compile with O2)
 ATH_ENABLE_VECTORIZATION;
-namespace{
+namespace {
 /**
- * Component Merging helper methods 
+ * Component Merging helper methods
  */
 using namespace GSFUtils;
 
 /**
  * Based on
- * https://www.sciencedirect.com/science/article/pii/089812218990103X 
- * equation (16) 
+ * https://www.sciencedirect.com/science/article/pii/089812218990103X
+ * equation (16)
  * but not accounting for weights
- * covI * invCovJ + covJ * invCovI + (mean1-mean2) (invcov+invcov) (mean1-mean2)  
- */  
-[[maybe_unused]]
-float
-symmetricKL(const Component1D& componentI,
-            const Component1D& componentJ)
+ * covI * invCovJ + covJ * invCovI + (mean1-mean2) (invcov+invcov) (mean1-mean2)
+ */
+[[maybe_unused]] float
+symmetricKL(const Component1D& componentI, const Component1D& componentJ)
 {
   const double meanDifference = componentI.mean - componentJ.mean;
   const double inverCovSum = componentI.invCov + componentJ.invCov;
@@ -44,11 +42,10 @@ symmetricKL(const Component1D& componentI,
 }
 /**
  * https://arxiv.org/pdf/2001.00727.pdf
- * equation (10) 
+ * equation (10)
  * Same as above but accounting for weights
- */ 
-[[maybe_unused]]
-float
+ */
+[[maybe_unused]] float
 weightedSymmetricKL(const Component1D& componentI,
                     const Component1D& componentJ)
 {
@@ -64,13 +61,12 @@ weightedSymmetricKL(const Component1D& componentI,
 /*
  * Moment-preserving merge of two 1D components
  * for example see
- * Runnalls, Andrew R.(2007) 
+ * Runnalls, Andrew R.(2007)
  * Kullback-Leibler approach to Gaussian mixture reduction
  * equations (2),(3),(4)
  */
 void
-combine(GSFUtils::Component1D& updated, 
-        GSFUtils::Component1D& removed)
+combine(GSFUtils::Component1D& updated, GSFUtils::Component1D& removed)
 {
 
   const double sumWeight = updated.weight + removed.weight;
@@ -91,8 +87,8 @@ combine(GSFUtils::Component1D& updated,
   updated.invCov = 1. / sumVariance;
   updated.weight = sumWeight;
 
-  //large numbers to enter the multiplications/sums
-  //make distance large 
+  // large numbers to enter the multiplications/sums
+  // make distance large
   removed.mean = 1e10;
   removed.cov = 1e10;
   removed.invCov = 1e10;
@@ -100,7 +96,7 @@ combine(GSFUtils::Component1D& updated,
 }
 
 /**
- * Recalculate the distances given a merged input 
+ * Recalculate the distances given a merged input
  * and return the minimum index/distance wrt to this
  * new component
  */
@@ -110,28 +106,29 @@ recalculateDistances(const componentPtrRestrict componentsIn,
                      const int32_t mini,
                      const int32_t n)
 {
-  const Component1D* components =
-    static_cast<const Component1D*>(__builtin_assume_aligned(componentsIn, alignment));
-  float* distances = static_cast<float*>(__builtin_assume_aligned(distancesIn, alignment));
+  const Component1D* components = static_cast<const Component1D*>(
+    __builtin_assume_aligned(componentsIn, alignment));
+  float* distances =
+    static_cast<float*>(__builtin_assume_aligned(distancesIn, alignment));
 
   const int32_t j = mini;
   const int32_t indexConst = (j - 1) * j / 2;
-  //Rows
+  // Rows
   const Component1D componentJ = components[j];
   for (int32_t i = 0; i < j; ++i) {
     const Component1D componentI = components[i];
     const int32_t index = indexConst + i;
     distances[index] = symmetricKL(componentI, componentJ);
   }
-  //Columns
+  // Columns
   for (int32_t i = j + 1; i < n; ++i) {
     const int32_t index = (i - 1) * i / 2 + j;
     const Component1D componentI = components[i];
-    distances[index] = symmetricKL(componentI,componentJ);
+    distances[index] = symmetricKL(componentI, componentJ);
   }
 }
 
-/** 
+/**
  * Calculate the distances for all component pairs
  */
 void
@@ -140,15 +137,16 @@ calculateAllDistances(const componentPtrRestrict componentsIn,
                       const int32_t n)
 {
 
-  const Component1D* components =
-  static_cast<const Component1D*>(__builtin_assume_aligned(componentsIn, alignment));
-  float* distances = static_cast<float*>(__builtin_assume_aligned(distancesIn, alignment));
+  const Component1D* components = static_cast<const Component1D*>(
+    __builtin_assume_aligned(componentsIn, alignment));
+  float* distances =
+    static_cast<float*>(__builtin_assume_aligned(distancesIn, alignment));
   for (int32_t i = 1; i < n; ++i) {
-    const int32_t indexConst = (i-1) * i / 2;
+    const int32_t indexConst = (i - 1) * i / 2;
     const Component1D componentI = components[i];
     for (int32_t j = 0; j < i; ++j) {
       const Component1D componentJ = components[j];
-      distances[indexConst + j] = symmetricKL(componentI,componentJ);
+      distances[indexConst + j] = symmetricKL(componentI, componentJ);
     }
   }
 }
@@ -164,13 +162,13 @@ resetDistances(floatPtrRestrict distancesIn,
   float* distances = (float*)__builtin_assume_aligned(distancesIn, alignment);
   const int32_t j = minj;
   const int32_t indexConst = (j - 1) * j / 2;
-  //Rows
+  // Rows
   for (int32_t i = 0; i < j; ++i) {
     distances[indexConst + i] = std::numeric_limits<float>::max();
   }
-  //Columns
-  for (int32_t i = j+1; i < n; ++i) {
-    const int32_t index = (i-1)*i/2 + j;
+  // Columns
+  for (int32_t i = j + 1; i < n; ++i) {
+    const int32_t index = (i - 1) * i / 2 + j;
     distances[index] = std::numeric_limits<float>::max();
   }
 }
@@ -179,7 +177,7 @@ resetDistances(floatPtrRestrict distancesIn,
 namespace GSFUtils {
 
 /*
- * Merge the componentsIn and return 
+ * Merge the componentsIn and return
  * which componets got merged
  */
 std::vector<std::pair<int32_t, int32_t>>
@@ -187,42 +185,41 @@ findMerges(componentPtrRestrict componentsIn,
            const int32_t inputSize,
            const int32_t reducedSize)
 {
-  Component1D* components =
-    static_cast<Component1D*>(__builtin_assume_aligned(componentsIn, alignment));
-  //Based on the inputSize allocate enough space for the pairwise distances
+  Component1D* components = static_cast<Component1D*>(
+    __builtin_assume_aligned(componentsIn, alignment));
+  // Based on the inputSize allocate enough space for the pairwise distances
   const int32_t n = inputSize;
-  const int32_t nn = n * (n-1)/2;
+  const int32_t nn = n * (n - 1) / 2;
   // Create a trianular mapping for the pairwise distances
   std::vector<triangularToIJ> convert;
   convert.reserve(nn);
-  for (int32_t i = 1; i<n; ++i) {
-    const int indexConst = (i-1) * i / 2;
-    for (int32_t j = 0; j<i; ++j) {
+  for (int32_t i = 1; i < n; ++i) {
+    const int indexConst = (i - 1) * i / 2;
+    for (int32_t j = 0; j < i; ++j) {
       int32_t index = indexConst + j;
-      convert[index]={i,j};
+      convert[index] = { i, j };
     }
   }
-  //We need to work with multiple of 8, in principle this is a requirement
-  //of aligned_alloc (although not in POSIX ) i.e allocation should be multiple
-  //of the requested size.
-  const int32_t nn2 =
-    (nn & 7) == 0 ? nn
-                  : nn + (8 - (nn & 7)); 
-  AlignedDynArray<float, alignment> distances(nn2, std::numeric_limits<float>::max());
-  
+  // We need to work with multiple of 8, in principle this is a requirement
+  // of aligned_alloc (although not in POSIX ) i.e allocation should be multiple
+  // of the requested size.
+  const int32_t nn2 = (nn & 7) == 0 ? nn : nn + (8 - (nn & 7));
+  AlignedDynArray<float, alignment> distances(
+    nn2, std::numeric_limits<float>::max());
+
   // vector to be returned
   std::vector<std::pair<int32_t, int32_t>> merges;
   merges.reserve(inputSize - reducedSize);
   // initial distance calculation
   calculateAllDistances(components, distances, n);
-  
+
   // merge loop
   int32_t numberOfComponentsLeft = n;
   while (numberOfComponentsLeft > reducedSize) {
     // see if we have the next already
     const std::pair<int32_t, float> minDis = findMinimumIndex(distances, nn2);
     const int32_t minIndex = minDis.first;
-    const triangularToIJ conversion= convert[minIndex];
+    const triangularToIJ conversion = convert[minIndex];
     const int32_t mini = conversion.I;
     const int32_t minj = conversion.J;
     // Combine the 2 components
@@ -232,7 +229,7 @@ findMerges(componentPtrRestrict componentsIn,
     // Reset old weights wrt the  minj position
     resetDistances(distances, minj, n);
     // keep track and decrement
-    merges.emplace_back(mini,minj);
+    merges.emplace_back(mini, minj);
     --numberOfComponentsLeft;
   } // end of merge while
   return merges;
@@ -255,7 +252,7 @@ findMerges(componentPtrRestrict componentsIn,
  * AVX2 intrinsics used :
  *
  * _mm256_set1_epi32
- * Broadcast 32-bit integer a to all elements of dst. 
+ * Broadcast 32-bit integer a to all elements of dst.
  *
  * _mm256_setr_epi32
  * Set packed 32-bit integers in dst with the supplied values in reverse order.
@@ -281,8 +278,7 @@ findMerges(componentPtrRestrict componentsIn,
  * Blend packed 8-bit integers from a and b using mask, and store the results
  * in dst.
  */
-__attribute__((target("avx2"))) 
-std::pair<int32_t,float>
+__attribute__((target("avx2"))) std::pair<int32_t, float>
 findMinimumIndex(const floatPtrRestrict distancesIn, const int n)
 {
   float* array = (float*)__builtin_assume_aligned(distancesIn, alignment);
@@ -296,12 +292,13 @@ findMinimumIndex(const floatPtrRestrict distancesIn, const int n)
     // increment the indices
     indicesIn = _mm256_add_epi32(indicesIn, increment);
     // Get a mask indicating when an element is less than the ones we have
-    __m256i lt = _mm256_castps_si256(_mm256_cmp_ps(values, minvalues, _CMP_LT_OS));
+    __m256i lt =
+      _mm256_castps_si256(_mm256_cmp_ps(values, minvalues, _CMP_LT_OS));
     // b lend select the indices to update
     minindices = _mm256_blendv_epi8(minindices, indicesIn, lt);
     minvalues = _mm256_min_ps(values, minvalues);
   }
-  //Do the final calculation scalar way
+  // Do the final calculation scalar way
   alignas(alignment) float distances[8];
   alignas(alignment) int32_t indices[8];
   _mm256_store_ps(distances, minvalues);
@@ -314,7 +311,7 @@ findMinimumIndex(const floatPtrRestrict distancesIn, const int n)
       minDistance = distances[i];
     }
   }
-  return {minIndex,minDistance};
+  return { minIndex, minDistance };
 }
 /*
  * SSE intrinsics used
@@ -344,12 +341,11 @@ findMinimumIndex(const floatPtrRestrict distancesIn, const int n)
  * for compilation and does not generate any instructions, thus it has zero
  * latency.
  */
-__attribute__((target("sse4.1"))) 
-std::pair<int32_t,float>
+__attribute__((target("sse4.1"))) std::pair<int32_t, float>
 findMinimumIndex(const floatPtrRestrict distancesIn, const int n)
 {
   float* array = (float*)__builtin_assume_aligned(distancesIn, alignment);
-  //Do 2 vectors of 4 elements , so 8 at time
+  // Do 2 vectors of 4 elements , so 8 at time
   const __m128i increment = _mm_set1_epi32(8);
   __m128i indices1 = _mm_setr_epi32(0, 1, 2, 3);
   __m128i indices2 = _mm_setr_epi32(4, 5, 6, 7);
@@ -373,7 +369,7 @@ findMinimumIndex(const floatPtrRestrict distancesIn, const int n)
     minindices2 = _mm_blendv_epi8(minindices2, indices2, lt2);
     minvalues2 = _mm_min_ps(values2, minvalues2);
   }
-  //Do the final calculation scalar way
+  // Do the final calculation scalar way
   alignas(alignment) float distances[8];
   alignas(alignment) int32_t indices[8];
   _mm_store_ps(distances, minvalues1);
@@ -389,7 +385,7 @@ findMinimumIndex(const floatPtrRestrict distancesIn, const int n)
       minDistance = distances[i];
     }
   }
-  return {minIndex,minDistance};
+  return { minIndex, minDistance };
 }
 /*
  * SSE2 does not have a blend/select instruction.
@@ -404,12 +400,11 @@ SSE2_mm_blendv_epi8(__m128i a, __m128i b, __m128i mask)
 {
   return _mm_or_si128(_mm_andnot_si128(mask, a), _mm_and_si128(mask, b));
 }
-__attribute__((target("sse2"))) 
-std::pair<int32_t,float>
+__attribute__((target("sse2"))) std::pair<int32_t, float>
 findMinimumIndex(const floatPtrRestrict distancesIn, const int n)
 {
   float* array = (float*)__builtin_assume_aligned(distancesIn, alignment);
-  //Do 2 vectors of 4 elements, so 8 at a time
+  // Do 2 vectors of 4 elements, so 8 at a time
   const __m128i increment = _mm_set1_epi32(8);
   __m128i indices1 = _mm_setr_epi32(0, 1, 2, 3);
   __m128i indices2 = _mm_setr_epi32(4, 5, 6, 7);
@@ -433,7 +428,7 @@ findMinimumIndex(const floatPtrRestrict distancesIn, const int n)
     minindices2 = SSE2_mm_blendv_epi8(minindices2, indices2, lt2);
     minvalues2 = _mm_min_ps(values2, minvalues2);
   }
-  //Do the final calculation scalar way
+  // Do the final calculation scalar way
   alignas(alignment) float distances[8];
   alignas(alignment) int32_t indices[8];
   _mm_store_ps(distances, minvalues1);
@@ -449,13 +444,13 @@ findMinimumIndex(const floatPtrRestrict distancesIn, const int n)
       minDistance = distances[i];
     }
   }
-  return {minIndex,minDistance};
+  return { minIndex, minDistance };
 }
 #endif // end of x86_64 versions
 /* Always fall back to a simple default version with no intrinsics */
 __attribute__((target("default")))
 #endif // HAVE_FUNCTION_MULTIVERSIONING
-std::pair<int32_t,float>
+std::pair<int32_t, float>
 findMinimumIndex(const floatPtrRestrict distancesIn, const int n)
 {
   float* array = (float*)__builtin_assume_aligned(distancesIn, alignment);
@@ -468,6 +463,6 @@ findMinimumIndex(const floatPtrRestrict distancesIn, const int n)
       minDistance = value;
     }
   }
-  return {minIndex,minDistance}; 
+  return { minIndex, minDistance };
 }
 } // end namespace GSFUtils
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/MultiComponentStateAssembler.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/MultiComponentStateAssembler.cxx
index 01b4f7d61f5109b724ffc67413c5e390f5d40047..500870bdc653481e64fa67433001043705cf4326 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/MultiComponentStateAssembler.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/MultiComponentStateAssembler.cxx
@@ -40,18 +40,23 @@ Trk::MultiComponentStateAssembler::reset(Cache& cache)
 }
 
 bool
-Trk::MultiComponentStateAssembler::addComponent(Cache& cache, ComponentParameters&& componentParameters)
+Trk::MultiComponentStateAssembler::addComponent(
+  Cache& cache,
+  ComponentParameters&& componentParameters)
 {
   if (cache.assemblyDone) {
     return false;
   }
   cache.validWeightSum += componentParameters.second;
-  cache.multiComponentState.emplace_back(componentParameters.first.release(), componentParameters.second);
+  cache.multiComponentState.emplace_back(componentParameters.first.release(),
+                                         componentParameters.second);
   return true;
 }
 
 bool
-Trk::MultiComponentStateAssembler::addMultiState(Cache& cache, Trk::MultiComponentState&& multiComponentState)
+Trk::MultiComponentStateAssembler::addMultiState(
+  Cache& cache,
+  Trk::MultiComponentState&& multiComponentState)
 {
   if (cache.assemblyDone) {
     return false;
@@ -59,7 +64,8 @@ Trk::MultiComponentStateAssembler::addMultiState(Cache& cache, Trk::MultiCompone
   double sumW(0.);
   for (auto& component : multiComponentState) {
     sumW += component.second;
-    cache.multiComponentState.emplace_back(component.first.release(), component.second);
+    cache.multiComponentState.emplace_back(component.first.release(),
+                                           component.second);
   }
   multiComponentState.clear();
   cache.validWeightSum += sumW;
@@ -67,7 +73,9 @@ Trk::MultiComponentStateAssembler::addMultiState(Cache& cache, Trk::MultiCompone
 }
 
 bool
-Trk::MultiComponentStateAssembler::addInvalidComponentWeight(Cache& cache, const double invalidComponentWeight)
+Trk::MultiComponentStateAssembler::addInvalidComponentWeight(
+  Cache& cache,
+  const double invalidComponentWeight)
 {
   cache.invalidWeightSum += invalidComponentWeight;
   return true;
@@ -78,13 +86,14 @@ Trk::MultiComponentStateAssembler::prepareStateForAssembly(Cache& cache)
 {
   // Protect against empty state
   if (!isStateValid(cache)) {
-      return false;
+    return false;
   }
 
   // Check for minimum fraction of valid states
   double den = cache.validWeightSum + cache.invalidWeightSum;
   double validWeightFraction = den > 0 ? cache.validWeightSum / den : 0;
-  if (cache.invalidWeightSum > 0. && validWeightFraction < cache.minimumValidFraction) {
+  if (cache.invalidWeightSum > 0. &&
+      validWeightFraction < cache.minimumValidFraction) {
     return false;
   }
   // Check to see assembly has not already been done
@@ -95,7 +104,9 @@ Trk::MultiComponentStateAssembler::prepareStateForAssembly(Cache& cache)
   /*
    * Sort Multi-Component State by weights
    */
-  std::sort(cache.multiComponentState.begin(), cache.multiComponentState.end(), SortByLargerSimpleComponentWeight());
+  std::sort(cache.multiComponentState.begin(),
+            cache.multiComponentState.end(),
+            SortByLargerSimpleComponentWeight());
 
   double totalWeight(cache.validWeightSum + cache.invalidWeightSum);
   if (totalWeight != 0.) {
@@ -105,7 +116,8 @@ Trk::MultiComponentStateAssembler::prepareStateForAssembly(Cache& cache)
      * are before the value (i.e ordered descending).
      * return the 1st element where (element<value)
      */
-    ComponentParameters dummySmallestWeight(nullptr, cache.minimumFractionalWeight * totalWeight);
+    ComponentParameters dummySmallestWeight(
+      nullptr, cache.minimumFractionalWeight * totalWeight);
     auto lower_than = std::upper_bound(cache.multiComponentState.begin(),
                                        cache.multiComponentState.end(),
                                        dummySmallestWeight,
@@ -114,7 +126,9 @@ Trk::MultiComponentStateAssembler::prepareStateForAssembly(Cache& cache)
      * reverse iterate , so as to delete removing the last
      */
     auto lower_than_reverse = std::make_reverse_iterator(lower_than);
-    for (auto itr = cache.multiComponentState.rbegin(); itr != lower_than_reverse; ++itr) {
+    for (auto itr = cache.multiComponentState.rbegin();
+         itr != lower_than_reverse;
+         ++itr) {
       cache.multiComponentState.erase(itr.base() - 1);
     }
   }
@@ -141,7 +155,8 @@ Trk::MultiComponentStateAssembler::assembledState(Cache& cache)
 }
 
 Trk::MultiComponentState
-Trk::MultiComponentStateAssembler::assembledState(Cache& cache, const double newWeight)
+Trk::MultiComponentStateAssembler::assembledState(Cache& cache,
+                                                  const double newWeight)
 {
   if (!prepareStateForAssembly(cache)) {
     return {};
@@ -150,16 +165,17 @@ Trk::MultiComponentStateAssembler::assembledState(Cache& cache, const double new
 }
 
 Trk::MultiComponentState
-Trk::MultiComponentStateAssembler::doStateAssembly(Cache& cache, const double newWeight)
+Trk::MultiComponentStateAssembler::doStateAssembly(Cache& cache,
+                                                   const double newWeight)
 {
   if (!isStateValid(cache)) {
     return {};
   }
-  const size_t cacheSize=cache.multiComponentState.size();
+  const size_t cacheSize = cache.multiComponentState.size();
 
   if (cache.validWeightSum <= 0.) {
     if (!cache.multiComponentState.empty()) {
-      const double fixedWeights = 1. /static_cast<double>(cacheSize);
+      const double fixedWeights = 1. / static_cast<double>(cacheSize);
       for (auto& component : cache.multiComponentState) {
         component.second = fixedWeights;
       }
@@ -175,9 +191,11 @@ Trk::MultiComponentStateAssembler::doStateAssembly(Cache& cache, const double ne
   }
   Trk::MultiComponentState assembledState;
   assembledState.reserve(cacheSize);
-  const double scalingFactor = cache.validWeightSum > 0. ? newWeight / cache.validWeightSum : 1.;
+  const double scalingFactor =
+    cache.validWeightSum > 0. ? newWeight / cache.validWeightSum : 1.;
   for (auto& component : cache.multiComponentState) {
-    assembledState.emplace_back(component.first.release(), component.second * scalingFactor);
+    assembledState.emplace_back(component.first.release(),
+                                component.second * scalingFactor);
   }
   // Reset the cache before leaving
   reset(cache);
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/MultiComponentStateCombiner.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/MultiComponentStateCombiner.cxx
index 4b8742f9714cd8098a57c80cafe1f437170fe851..e41a362475af2046c1632e42372be1784335c0dd 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/MultiComponentStateCombiner.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/MultiComponentStateCombiner.cxx
@@ -7,7 +7,8 @@
       -----------------------------------------------
 begin                : Monday 20th December 2004
 author               : atkinson,morley,anastopoulos
-description          : Implementation code for MultiComponentStateCombiner helpers
+description          : Implementation code for MultiComponentStateCombiner
+helpers
 *********************************************************************************/
 
 #include "TrkGaussianSumFilter/MultiComponentStateCombiner.h"
@@ -16,26 +17,30 @@ description          : Implementation code for MultiComponentStateCombiner helpe
 #include "TrkSurfaces/Surface.h"
 
 std::unique_ptr<Trk::TrackParameters>
-Trk::MultiComponentStateCombiner::combine(const Trk::MultiComponentState& uncombinedState,
-                                          const bool useMode,
-                                          const double fractionPDFused)
+Trk::MultiComponentStateCombiner::combine(
+  const Trk::MultiComponentState& uncombinedState,
+  const bool useMode,
+  const double fractionPDFused)
 {
-  std::unique_ptr<Trk::ComponentParameters> combinedComponent = compute(&uncombinedState, useMode, fractionPDFused);
+  std::unique_ptr<Trk::ComponentParameters> combinedComponent =
+    compute(&uncombinedState, useMode, fractionPDFused);
   return std::move(combinedComponent->first);
 }
 
 std::unique_ptr<Trk::ComponentParameters>
-Trk::MultiComponentStateCombiner::combineWithWeight(const Trk::MultiComponentState& uncombinedState,
-                                                    const bool useMode,
-                                                    const double fractionPDFused)
+Trk::MultiComponentStateCombiner::combineWithWeight(
+  const Trk::MultiComponentState& uncombinedState,
+  const bool useMode,
+  const double fractionPDFused)
 
 {
   return compute(&uncombinedState, useMode, fractionPDFused);
 }
 
 void
-Trk::MultiComponentStateCombiner::combineWithWeight(Trk::ComponentParameters& mergeTo,
-                                                    const Trk::ComponentParameters& addThis)
+Trk::MultiComponentStateCombiner::combineWithWeight(
+  Trk::ComponentParameters& mergeTo,
+  const Trk::ComponentParameters& addThis)
 {
 
   const Trk::TrackParameters* firstParameters = mergeTo.first.get();
@@ -64,7 +69,8 @@ Trk::MultiComponentStateCombiner::combineWithWeight(Trk::ComponentParameters& me
     parameters[2] -= 2 * M_PI;
   }
 
-  mean = firstWeight * firstParameters->parameters() + secondWeight * parameters;
+  mean =
+    firstWeight * firstParameters->parameters() + secondWeight * parameters;
   mean /= totalWeight;
 
   // Ensure that phi is between -pi and pi
@@ -75,8 +81,8 @@ Trk::MultiComponentStateCombiner::combineWithWeight(Trk::ComponentParameters& me
     mean[2] += 2 * M_PI;
   }
 
-  // Extract local error matrix: Must make sure track parameters are measured, ie have an associated
-  // error matrix.
+  // Extract local error matrix: Must make sure track parameters are measured,
+  // ie have an associated error matrix.
   if (firstMeasuredCov && secondMeasuredCov) {
     AmgSymMatrix(5) covariance;
     AmgSymMatrix(5) covariancePart1;
@@ -84,8 +90,10 @@ Trk::MultiComponentStateCombiner::combineWithWeight(Trk::ComponentParameters& me
     AmgSymMatrix(5) covariancePart2;
     covariancePart2.setZero();
 
-    covariancePart1 = firstWeight * (*firstMeasuredCov) + secondWeight * (*secondMeasuredCov);
-    AmgVector(5) parameterDifference = firstParameters->parameters() - parameters;
+    covariancePart1 =
+      firstWeight * (*firstMeasuredCov) + secondWeight * (*secondMeasuredCov);
+    AmgVector(5) parameterDifference =
+      firstParameters->parameters() - parameters;
 
     if (parameterDifference[2] > M_PI) {
       parameterDifference[2] -= 2 * M_PI;
@@ -93,8 +101,10 @@ Trk::MultiComponentStateCombiner::combineWithWeight(Trk::ComponentParameters& me
       parameterDifference[2] += 2 * M_PI;
     }
 
-    covariancePart2 = firstWeight * secondWeight * parameterDifference * parameterDifference.transpose();
-    covariance = covariancePart1 / totalWeight + covariancePart2 / (totalWeight * totalWeight);
+    covariancePart2 = firstWeight * secondWeight * parameterDifference *
+                      parameterDifference.transpose();
+    covariance = covariancePart1 / totalWeight +
+                 covariancePart2 / (totalWeight * totalWeight);
 
     mergeTo.first->updateParameters(mean, covariance);
     mergeTo.second = totalWeight;
@@ -105,22 +115,25 @@ Trk::MultiComponentStateCombiner::combineWithWeight(Trk::ComponentParameters& me
 }
 
 std::unique_ptr<Trk::ComponentParameters>
-Trk::MultiComponentStateCombiner::compute(const Trk::MultiComponentState* uncombinedState,
-                                          const bool useMode,
-                                          const double fractionPDFused)
+Trk::MultiComponentStateCombiner::compute(
+  const Trk::MultiComponentState* uncombinedState,
+  const bool useMode,
+  const double fractionPDFused)
 {
   if (uncombinedState->empty()) {
     return nullptr;
   }
 
-  const Trk::TrackParameters* firstParameters = uncombinedState->front().first.get();
+  const Trk::TrackParameters* firstParameters =
+    uncombinedState->front().first.get();
 
   // Check to see if first track parameters are measured or not
   const AmgSymMatrix(5)* firstMeasuredCov = firstParameters->covariance();
 
-  if (uncombinedState->size() == 1)
-    return std::make_unique<Trk::ComponentParameters>(uncombinedState->front().first->clone(),
-                                                      uncombinedState->front().second);
+  if (uncombinedState->size() == 1) {
+    return std::make_unique<Trk::ComponentParameters>(
+      uncombinedState->front().first->clone(), uncombinedState->front().second);
+  }
 
   double sumW(0.);
   const int dimension = (uncombinedState->front()).first->parameters().rows();
@@ -154,7 +167,8 @@ Trk::MultiComponentStateCombiner::compute(const Trk::MultiComponentState* uncomb
 
     // Ensure that we don't have any problems with the cyclical nature of phi
     // Use first state as reference poin
-    double deltaPhi = (*uncombinedState->begin()).first->parameters()[2] - parameters[2];
+    double deltaPhi =
+      (*uncombinedState->begin()).first->parameters()[2] - parameters[2];
 
     if (deltaPhi > M_PI) {
       parameters[2] += 2 * M_PI;
@@ -165,11 +179,11 @@ Trk::MultiComponentStateCombiner::compute(const Trk::MultiComponentState* uncomb
     sumW += weight;
     mean += weight * parameters;
 
-    // Extract local error matrix: Must make sure track parameters are measured, ie have an
-    // associated error matrix.
+    // Extract local error matrix: Must make sure track parameters are measured,
+    // ie have an associated error matrix.
     const AmgSymMatrix(5)* measuredCov = trackParameters->covariance();
 
-    // Calculate the combined covariance matrix 
+    // Calculate the combined covariance matrix
     // \sigma = \Sum_{m=1}^{M} w_{m}(\sigma_m + (\mu_m-\mu)(\mu_m-\mu)^{T})
     if (measuredCov) {
       // Changed from errorMatrixInMeasurementFrame
@@ -177,27 +191,37 @@ Trk::MultiComponentStateCombiner::compute(const Trk::MultiComponentState* uncomb
       covariancePart1 += weight * (*measuredCov);
 
       /* ============================================================================
-         Loop over all remaining components to find the second part of the covariance
-         ============================================================================ */
+         Loop over all remaining components to find the second part of the
+         covariance
+         ============================================================================
+       */
 
-      Trk::MultiComponentState::const_iterator remainingComponentIterator = component;
+      Trk::MultiComponentState::const_iterator remainingComponentIterator =
+        component;
 
-      for (; remainingComponentIterator != uncombinedState->end(); ++remainingComponentIterator) {
+      for (; remainingComponentIterator != uncombinedState->end();
+           ++remainingComponentIterator) {
 
-        if (remainingComponentIterator == component)
+        if (remainingComponentIterator == component) {
           continue;
+        }
 
-        AmgVector(5) parameterDifference = parameters - ((*remainingComponentIterator).first)->parameters();
+        AmgVector(5) parameterDifference =
+          parameters - ((*remainingComponentIterator).first)->parameters();
 
-        double remainingComponentIteratorWeight = (*remainingComponentIterator).second;
+        double remainingComponentIteratorWeight =
+          (*remainingComponentIterator).second;
 
-        covariancePart2 += weight * remainingComponentIteratorWeight * parameterDifference * parameterDifference.transpose();
+        covariancePart2 += weight * remainingComponentIteratorWeight *
+                           parameterDifference *
+                           parameterDifference.transpose();
 
       } // end loop over remaining components
 
     } // end clause if errors are involved
-    if (weight / totalWeight > fractionPDFused)
+    if (weight / totalWeight > fractionPDFused) {
       break;
+    }
   } // end loop over all components
 
   mean /= sumW;
@@ -215,7 +239,8 @@ Trk::MultiComponentStateCombiner::compute(const Trk::MultiComponentState* uncomb
   if (useMode && dimension == 5) {
 
     // Calculate the mode of the q/p distribution
-    std::array<double, 10> modes = Trk::MultiComponentStateModeCalculator::calculateMode(*uncombinedState);
+    std::array<double, 10> modes =
+      Trk::MultiComponentStateModeCalculator::calculateMode(*uncombinedState);
 
     //  Replace mean with mode if qOverP mode is not 0
     if (modes[4] != 0) {
@@ -280,14 +305,17 @@ Trk::MultiComponentStateCombiner::compute(const Trk::MultiComponentState* uncomb
   double phi = mean[Trk::phi];
   double theta = mean[Trk::theta];
   double qoverp = mean[Trk::qOverP];
-  if (firstMeasuredCov)
+  if (firstMeasuredCov) {
     combinedTrackParameters.reset(
-      firstParameters->associatedSurface().createTrackParameters(loc1, loc2, phi, theta, qoverp, covariance));
-  else {
+      firstParameters->associatedSurface().createTrackParameters(
+        loc1, loc2, phi, theta, qoverp, covariance));
+  } else {
     combinedTrackParameters.reset(
-      firstParameters->associatedSurface().createTrackParameters(loc1, loc2, phi, theta, qoverp, nullptr));
+      firstParameters->associatedSurface().createTrackParameters(
+        loc1, loc2, phi, theta, qoverp, nullptr));
     delete covariance;
   }
 
-  return std::make_unique<ComponentParameters>(std::move(combinedTrackParameters), totalWeight);
+  return std::make_unique<ComponentParameters>(
+    std::move(combinedTrackParameters), totalWeight);
 }
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/MultiComponentStateModeCalculator.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/MultiComponentStateModeCalculator.cxx
index 20f0115c47bc54634ff54314c9a69e306ef15d02..1f109fe8bbf407aa77087a9733778a041d76e6f7 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/MultiComponentStateModeCalculator.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/MultiComponentStateModeCalculator.cxx
@@ -8,7 +8,8 @@
 begin                : Thursday 6th July 2006
 author               : atkinson , amorley , anastopoulos
 email                : amorley@cern.ch
-description          : Implementation code for MultiComponentStateModeCalculator class
+description          : Implementation code for MultiComponentStateModeCalculator
+class
 ****************************************************************************************/
 
 #include "TrkGaussianSumFilter/MultiComponentStateModeCalculator.h"
@@ -20,7 +21,8 @@ const double invsqrt2PI = 1. / sqrt(2. * M_PI);
 }
 
 std::array<double, 10>
-Trk::MultiComponentStateModeCalculator::calculateMode(const Trk::MultiComponentState& multiComponentState)
+Trk::MultiComponentStateModeCalculator::calculateMode(
+  const Trk::MultiComponentState& multiComponentState)
 {
   std::array<double, 10> modes{};
   // Check to see if the multi-component state is measured
@@ -52,8 +54,8 @@ Trk::MultiComponentStateModeCalculator::calculateMode(const Trk::MultiComponentS
       }
     }
     modes[i] = findMode(largerMeanComponent, i, mixture);
-    // Calculate the FWHM and return this back so that it can be used to correct the covariance
-    // matrix
+    // Calculate the FWHM and return this back so that it can be used to correct
+    // the covariance matrix
     if (largerMeanComponent != modes[i]) {
       // mode calculation was successful now calulate FWHM
       double currentWidth = width(i, mixture);
@@ -72,7 +74,8 @@ Trk::MultiComponentStateModeCalculator::calculateMode(const Trk::MultiComponentS
         }
       }
 
-      bool highXFound = findRoot(highX, modes[i], upperbound, pdfVal * 0.5, i, mixture);
+      bool highXFound =
+        findRoot(highX, modes[i], upperbound, pdfVal * 0.5, i, mixture);
 
       double lowerbound = modes[i] - 1.5 * currentWidth;
       while (true) {
@@ -82,7 +85,8 @@ Trk::MultiComponentStateModeCalculator::calculateMode(const Trk::MultiComponentS
           break;
         }
       }
-      bool lowXFound = findRoot(lowX, lowerbound, modes[i], pdfVal * 0.5, i, mixture);
+      bool lowXFound =
+        findRoot(lowX, lowerbound, modes[i], pdfVal * 0.5, i, mixture);
       if (highXFound && lowXFound) {
         double FWHM = highX - lowX;
         modes[i + 5] = FWHM / 2.35482; // 2 * sqrt( 2* log(2))
@@ -101,8 +105,9 @@ Trk::MultiComponentStateModeCalculator::calculateMode(const Trk::MultiComponentS
 }
 
 void
-Trk::MultiComponentStateModeCalculator::fillMixture(const Trk::MultiComponentState& multiComponentState,
-                                                    std::array<std::vector<Component>, 5>& mixture)
+Trk::MultiComponentStateModeCalculator::fillMixture(
+  const Trk::MultiComponentState& multiComponentState,
+  std::array<std::vector<Component>, 5>& mixture)
 {
 
   for (int i = 0; i < 5; i++) {
@@ -110,28 +115,33 @@ Trk::MultiComponentStateModeCalculator::fillMixture(const Trk::MultiComponentSta
   }
 
   // Loop over all the components in the multi-component state
-  Trk::MultiComponentState::const_iterator component = multiComponentState.begin();
-  Trk::ParamDefs parameter[5] = { Trk::d0, Trk::z0, Trk::phi, Trk::theta, Trk::qOverP };
+  Trk::MultiComponentState::const_iterator component =
+    multiComponentState.begin();
+  Trk::ParamDefs parameter[5] = {
+    Trk::d0, Trk::z0, Trk::phi, Trk::theta, Trk::qOverP
+  };
   for (; component != multiComponentState.end(); ++component) {
     for (int i = 0; i < 5; ++i) {
       const Trk::TrackParameters* componentParameters = component->first.get();
 
       const AmgSymMatrix(5)* measuredCov = componentParameters->covariance();
 
-      if (!measuredCov)
+      if (!measuredCov) {
         return;
+      }
       // Enums for Perigee //
       //                           d0=0, z0=1, phi0=2, theta=3, qOverP=4,
       double weight = component->second;
       double mean = componentParameters->parameters()[parameter[i]];
-      // FIXME ATLASRECTS-598 this fabs() should not be necessary... for some reason
-      // cov(qOverP,qOverP) can be negative
+      // FIXME ATLASRECTS-598 this fabs() should not be necessary... for some
+      // reason cov(qOverP,qOverP) can be negative
       double sigma = sqrt(fabs((*measuredCov)(parameter[i], parameter[i])));
 
       // Ensure that we don't have any problems with the cyclical nature of phi
       // Use first state as reference point
       if (i == 2) { // phi
-        double deltaPhi = multiComponentState.begin()->first->parameters()[2] - mean;
+        double deltaPhi =
+          multiComponentState.begin()->first->parameters()[2] - mean;
         if (deltaPhi > M_PI) {
           mean += 2 * M_PI;
         } else if (deltaPhi < -M_PI) {
@@ -145,9 +155,10 @@ Trk::MultiComponentStateModeCalculator::fillMixture(const Trk::MultiComponentSta
 }
 
 double
-Trk::MultiComponentStateModeCalculator::findMode(double xStart,
-                                                 int i,
-                                                 const std::array<std::vector<Component>, 5>& mixture)
+Trk::MultiComponentStateModeCalculator::findMode(
+  double xStart,
+  int i,
+  const std::array<std::vector<Component>, 5>& mixture)
 {
 
   int iteration(0);
@@ -187,9 +198,10 @@ Trk::MultiComponentStateModeCalculator::findMode(double xStart,
 }
 
 double
-Trk::MultiComponentStateModeCalculator::findModeGlobal(double mean,
-                                                       int i,
-                                                       const std::array<std::vector<Component>, 5>& mixture)
+Trk::MultiComponentStateModeCalculator::findModeGlobal(
+  double mean,
+  int i,
+  const std::array<std::vector<Component>, 5>& mixture)
 {
 
   double start(-1);
@@ -217,21 +229,28 @@ Trk::MultiComponentStateModeCalculator::findModeGlobal(double mean,
 }
 
 double
-Trk::MultiComponentStateModeCalculator::pdf(double x, int i, const std::array<std::vector<Component>, 5>& mixture)
+Trk::MultiComponentStateModeCalculator::pdf(
+  double x,
+  int i,
+  const std::array<std::vector<Component>, 5>& mixture)
 {
 
   double pdf(0.);
 
   auto component = mixture[i].begin();
 
-  for (; component != mixture[i].end(); ++component)
+  for (; component != mixture[i].end(); ++component) {
     pdf += component->weight * gaus(x, component->mean, component->sigma);
+  }
 
   return pdf;
 }
 
 double
-Trk::MultiComponentStateModeCalculator::d1pdf(double x, int i, const std::array<std::vector<Component>, 5>& mixture)
+Trk::MultiComponentStateModeCalculator::d1pdf(
+  double x,
+  int i,
+  const std::array<std::vector<Component>, 5>& mixture)
 {
 
   double result(0.);
@@ -242,14 +261,18 @@ Trk::MultiComponentStateModeCalculator::d1pdf(double x, int i, const std::array<
 
     double z = (x - component->mean) / component->sigma;
 
-    result += -1. * component->weight * z * gaus(x, component->mean, component->sigma) / component->sigma;
+    result += -1. * component->weight * z *
+              gaus(x, component->mean, component->sigma) / component->sigma;
   }
 
   return result;
 }
 
 double
-Trk::MultiComponentStateModeCalculator::d2pdf(double x, int i, const std::array<std::vector<Component>, 5>& mixture)
+Trk::MultiComponentStateModeCalculator::d2pdf(
+  double x,
+  int i,
+  const std::array<std::vector<Component>, 5>& mixture)
 {
 
   double result(0.);
@@ -260,21 +283,23 @@ Trk::MultiComponentStateModeCalculator::d2pdf(double x, int i, const std::array<
 
     double z = (x - component->mean) / component->sigma;
 
-    result += component->weight / (component->sigma * component->sigma) * (z * z - 1.) *
-              gaus(x, component->mean, component->sigma);
+    result += component->weight / (component->sigma * component->sigma) *
+              (z * z - 1.) * gaus(x, component->mean, component->sigma);
   }
 
   return result;
 }
 
 double
-Trk::MultiComponentStateModeCalculator::gaus(double x, double mean, double sigma)
+Trk::MultiComponentStateModeCalculator::gaus(double x,
+                                             double mean,
+                                             double sigma)
 {
 
   /*
    * gauss = 1/(sigma * sqrt(2*pi)) * exp  ( -0.5 * ((x-mean)/sigma)^2 )
-   * =(1/sqrt(2*pi))* (1/sigma)  * exp  (-0.5 * ((x-mean)*(1/sigma)) * ((x-mean)*(1/sigma)) )
-   * = invsqrt2PI * invertsigma * exp (-0.5 *z * z)
+   * =(1/sqrt(2*pi))* (1/sigma)  * exp  (-0.5 * ((x-mean)*(1/sigma)) *
+   * ((x-mean)*(1/sigma)) ) = invsqrt2PI * invertsigma * exp (-0.5 *z * z)
    */
   double invertsigma = 1. / sigma;
   double z = (x - mean) * invertsigma;
@@ -283,31 +308,35 @@ Trk::MultiComponentStateModeCalculator::gaus(double x, double mean, double sigma
 }
 
 double
-Trk::MultiComponentStateModeCalculator::width(int i, const std::array<std::vector<Component>, 5>& mixture)
+Trk::MultiComponentStateModeCalculator::width(
+  int i,
+  const std::array<std::vector<Component>, 5>& mixture)
 {
 
   double pdf(0.);
 
   auto component = mixture[i].begin();
 
-  for (; component != mixture[i].end(); ++component)
+  for (; component != mixture[i].end(); ++component) {
     pdf += component->weight * component->sigma;
+  }
 
   return pdf;
 }
 
 double
-Trk::MultiComponentStateModeCalculator::findRoot(double& result,
-                                                 double xlo,
-                                                 double xhi,
-                                                 double value,
-                                                 double i,
-                                                 const std::array<std::vector<Component>, 5>& mixture)
+Trk::MultiComponentStateModeCalculator::findRoot(
+  double& result,
+  double xlo,
+  double xhi,
+  double value,
+  double i,
+  const std::array<std::vector<Component>, 5>& mixture)
 {
-  // Do the root finding using the Brent-Decker method. Returns a boolean status and
-  // loads 'result' with our best guess at the root if true.
-  // Prints a warning if the initial interval does not bracket a single
-  // root or if the root is not found after a fixed number of iterations.
+  // Do the root finding using the Brent-Decker method. Returns a boolean status
+  // and loads 'result' with our best guess at the root if true. Prints a
+  // warning if the initial interval does not bracket a single root or if the
+  // root is not found after a fixed number of iterations.
 
   double a(xlo);
   double b(xhi);
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/PosteriorWeightsCalculator.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/PosteriorWeightsCalculator.cxx
index 24e2300ee099f42f25694013ccbb2c283936bd48..23fc5777c24b1a964ef07b8fa9fe60eba5737163 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/PosteriorWeightsCalculator.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/PosteriorWeightsCalculator.cxx
@@ -18,7 +18,9 @@ description          : Implementation code for PosteriorWeightsCalculator class
 #include "TrkParameters/TrackParameters.h"
 
 std::vector<Trk::ComponentParameters>
-Trk::PosteriorWeightsCalculator::weights(MultiComponentState&& predictedState, const MeasurementBase& measurement) const
+Trk::PosteriorWeightsCalculator::weights(
+  MultiComponentState&& predictedState,
+  const MeasurementBase& measurement) const
 {
 
   const size_t predictedStateSize = predictedState.size();
@@ -40,19 +42,22 @@ Trk::PosteriorWeightsCalculator::weights(MultiComponentState&& predictedState, c
 
   for (; component != predictedState.end(); ++component) {
 
-    const Trk::TrackParameters* componentTrackParameters = (*component).first.get();
+    const Trk::TrackParameters* componentTrackParameters =
+      (*component).first.get();
 
     if (!componentTrackParameters) {
       continue;
     }
 
-    const AmgSymMatrix(5)* predictedCov = componentTrackParameters->covariance();
+    const AmgSymMatrix(5)* predictedCov =
+      componentTrackParameters->covariance();
 
     if (!predictedCov) {
       continue;
     }
 
-    const Trk::LocalParameters& measurementLocalParameters = measurement.localParameters();
+    const Trk::LocalParameters& measurementLocalParameters =
+      measurement.localParameters();
     std::pair<double, double> result(0, 0);
     int nLocCoord = measurement.localParameters().dimension();
     if (nLocCoord == 1) {
@@ -63,35 +68,40 @@ Trk::PosteriorWeightsCalculator::weights(MultiComponentState&& predictedState, c
                                   measurementLocalParameters.parameterKey());
     } else if (nLocCoord == 2) {
       if (measurementLocalParameters.parameterKey() == 3) {
-        result = calculateWeight_2D_3(componentTrackParameters,
-                                      predictedCov,
-                                      measurementLocalParameters.block<2, 1>(0, 0),
-                                      measurement.localCovariance().block<2, 2>(0, 0));
+        result =
+          calculateWeight_2D_3(componentTrackParameters,
+                               predictedCov,
+                               measurementLocalParameters.block<2, 1>(0, 0),
+                               measurement.localCovariance().block<2, 2>(0, 0));
       } else {
-        result = calculateWeight_T<2>(componentTrackParameters,
-                                      predictedCov,
-                                      measurementLocalParameters.block<2, 1>(0, 0),
-                                      measurement.localCovariance().block<2, 2>(0, 0),
-                                      measurementLocalParameters.parameterKey());
+        result =
+          calculateWeight_T<2>(componentTrackParameters,
+                               predictedCov,
+                               measurementLocalParameters.block<2, 1>(0, 0),
+                               measurement.localCovariance().block<2, 2>(0, 0),
+                               measurementLocalParameters.parameterKey());
       }
     } else if (nLocCoord == 3) {
-      result = calculateWeight_T<3>(componentTrackParameters,
-                                    predictedCov,
-                                    measurementLocalParameters.block<3, 1>(0, 0),
-                                    measurement.localCovariance().block<3, 3>(0, 0),
-                                    measurementLocalParameters.parameterKey());
+      result =
+        calculateWeight_T<3>(componentTrackParameters,
+                             predictedCov,
+                             measurementLocalParameters.block<3, 1>(0, 0),
+                             measurement.localCovariance().block<3, 3>(0, 0),
+                             measurementLocalParameters.parameterKey());
     } else if (nLocCoord == 4) {
-      result = calculateWeight_T<4>(componentTrackParameters,
-                                    predictedCov,
-                                    measurementLocalParameters.block<4, 1>(0, 0),
-                                    measurement.localCovariance().block<4, 4>(0, 0),
-                                    measurementLocalParameters.parameterKey());
+      result =
+        calculateWeight_T<4>(componentTrackParameters,
+                             predictedCov,
+                             measurementLocalParameters.block<4, 1>(0, 0),
+                             measurement.localCovariance().block<4, 4>(0, 0),
+                             measurementLocalParameters.parameterKey());
     } else if (nLocCoord == 5) {
-      result = calculateWeight_T<5>(componentTrackParameters,
-                                    predictedCov,
-                                    measurementLocalParameters.block<5, 1>(0, 0),
-                                    measurement.localCovariance().block<5, 5>(0, 0),
-                                    measurementLocalParameters.parameterKey());
+      result =
+        calculateWeight_T<5>(componentTrackParameters,
+                             predictedCov,
+                             measurementLocalParameters.block<5, 1>(0, 0),
+                             measurement.localCovariance().block<5, 5>(0, 0),
+                             measurementLocalParameters.parameterKey());
     } else {
       break;
     }
@@ -103,12 +113,14 @@ Trk::PosteriorWeightsCalculator::weights(MultiComponentState&& predictedState, c
     componentDeterminantR.push_back(result.first);
     componentChi2.push_back(result.second);
 
-    if (result.second < minimumChi2)
+    if (result.second < minimumChi2) {
       minimumChi2 = result.second;
+    }
 
   } // end loop over components
 
-  if (componentDeterminantR.size() != predictedState.size() || componentChi2.size() != predictedState.size()) {
+  if (componentDeterminantR.size() != predictedState.size() ||
+      componentChi2.size() != predictedState.size()) {
     returnMultiComponentState.clear();
     return {};
   }
@@ -128,26 +140,31 @@ Trk::PosteriorWeightsCalculator::weights(MultiComponentState&& predictedState, c
     double chi2 = componentChi2[index] - minimumChi2;
 
     double updatedWeight(0.);
-    // Determinant can not be belowe 1e-19 in CLHEP .... rather ugly but protect against 0
-    // determinants Normally occur when the component is a poor fit
+    // Determinant can not be belowe 1e-19 in CLHEP .... rather ugly but protect
+    // against 0 determinants Normally occur when the component is a poor fit
     if (componentDeterminantR[index] > 1e-20) {
-      updatedWeight = priorWeight * sqrt(1. / componentDeterminantR[index]) * exp(-0.5 * chi2);
+      updatedWeight = priorWeight * sqrt(1. / componentDeterminantR[index]) *
+                      exp(-0.5 * chi2);
     } else {
       updatedWeight = 1e-10;
     }
-    returnMultiComponentState.emplace_back(component->first.release(), updatedWeight);
+    returnMultiComponentState.emplace_back(component->first.release(),
+                                           updatedWeight);
     sumWeights += updatedWeight;
   }
 
   // Renormalise the state to total weight = 1
-  Trk::MultiComponentState::iterator returnComponent = returnMultiComponentState.begin();
+  Trk::MultiComponentState::iterator returnComponent =
+    returnMultiComponentState.begin();
   component = predictedState.begin();
   if (sumWeights > 0.) {
-    for (; returnComponent != returnMultiComponentState.end(); ++returnComponent, ++component) {
+    for (; returnComponent != returnMultiComponentState.end();
+         ++returnComponent, ++component) {
       (*returnComponent).second /= sumWeights;
     }
   } else {
-    for (; returnComponent != returnMultiComponentState.end(); ++returnComponent, ++component) {
+    for (; returnComponent != returnMultiComponentState.end();
+         ++returnComponent, ++component) {
       (*returnComponent).second = component->second;
     }
   }
@@ -156,26 +173,29 @@ Trk::PosteriorWeightsCalculator::weights(MultiComponentState&& predictedState, c
 }
 
 std::pair<double, double>
-Trk::PosteriorWeightsCalculator::calculateWeight_1D(const TrackParameters* componentTrackParameters,
-                                                    const AmgSymMatrix(5) * predictedCov,
-                                                    const double measPar,
-                                                    const double measCov,
-                                                    int paramKey) const
+Trk::PosteriorWeightsCalculator::calculateWeight_1D(
+  const TrackParameters* componentTrackParameters,
+  const AmgSymMatrix(5) * predictedCov,
+  const double measPar,
+  const double measCov,
+  int paramKey) const
 {
   // use measuring coordinate (variable "mk") instead of reduction matrix
   int mk = 0;
-  if (paramKey != 1)
-    for (int i = 0; i < 5; ++i)
+  if (paramKey != 1) {
+    for (int i = 0; i < 5; ++i) {
       if (paramKey & (1 << i)) {
         mk = i;
         break;
       }
+    }
+  }
 
   // Calculate the residual
   const double r = measPar - (componentTrackParameters->parameters())(mk);
 
-  // Residual covariance. Posterior weights is calculated used predicted state and measurement.
-  // Therefore add covariances
+  // Residual covariance. Posterior weights is calculated used predicted state
+  // and measurement. Therefore add covariances
   const double R = measCov + (*predictedCov)(mk, mk);
 
   if (R == 0) {
@@ -186,22 +206,26 @@ Trk::PosteriorWeightsCalculator::calculateWeight_1D(const TrackParameters* compo
 }
 
 std::pair<double, double>
-Trk::PosteriorWeightsCalculator::calculateWeight_2D_3(const TrackParameters* componentTrackParameters,
-                                                      const AmgSymMatrix(5) * predictedCov,
-                                                      const AmgVector(2) & measPar,
-                                                      const AmgSymMatrix(2) & measCov) const
+Trk::PosteriorWeightsCalculator::calculateWeight_2D_3(
+  const TrackParameters* componentTrackParameters,
+  const AmgSymMatrix(5) * predictedCov,
+  const AmgVector(2) & measPar,
+  const AmgSymMatrix(2) & measCov) const
 {
   // Calculate the residual
-  AmgVector(2) r = measPar - componentTrackParameters->parameters().block<2, 1>(0, 0);
-  // Residual covariance. Posterior weights is calculated used predicted state and measurement.
-  // Therefore add covariances
+  AmgVector(2) r =
+    measPar - componentTrackParameters->parameters().block<2, 1>(0, 0);
+  // Residual covariance. Posterior weights is calculated used predicted state
+  // and measurement. Therefore add covariances
   AmgSymMatrix(2) R(measCov + predictedCov->block<2, 2>(0, 0));
   // compute determinant of residual
   const double det = R.determinant();
   if (det == 0) {
-    // ATH_MSG_WARNING( "Determinant is 0, cannot invert matrix... Ignoring component" );
+    // ATH_MSG_WARNING( "Determinant is 0, cannot invert matrix... Ignoring
+    // component" );
     return std::pair<double, double>(0, 0);
   }
   // Compute Chi2
-  return std::pair<double, double>(det, 0.5 * ((r.transpose() * R.inverse() * r)(0, 0)));
+  return std::pair<double, double>(
+    det, 0.5 * ((r.transpose() * R.inverse() * r)(0, 0)));
 }
diff --git a/Tracking/TrkFitter/TrkGaussianSumFilter/src/QuickCloseComponentsMultiStateMerger.cxx b/Tracking/TrkFitter/TrkGaussianSumFilter/src/QuickCloseComponentsMultiStateMerger.cxx
index ee5ace1928cb9eb7b0ddca1ddb4b2a14035925a2..5f91cc28d8746dfabf34ffb6eff4b58c9d7a88f2 100644
--- a/Tracking/TrkFitter/TrkGaussianSumFilter/src/QuickCloseComponentsMultiStateMerger.cxx
+++ b/Tracking/TrkFitter/TrkGaussianSumFilter/src/QuickCloseComponentsMultiStateMerger.cxx
@@ -8,8 +8,8 @@
 begin                : Wednesday 3rd September 2008
 author               : amorley
 email                : Anthony.Morley@cern.ch
-decription           : Implementation code for QuickCloseComponentsMultiStateMerger
-                       class
+decription           : Implementation code for
+QuickCloseComponentsMultiStateMerger class
 *********************************************************************************/
 
 #include "TrkGaussianSumFilter/QuickCloseComponentsMultiStateMerger.h"
@@ -23,13 +23,15 @@ decription           : Implementation code for QuickCloseComponentsMultiStateMer
 using namespace GSFUtils;
 
 Trk::MultiComponentState
-Trk::QuickCloseComponentsMultiStateMerger::merge(Trk::MultiComponentState&& statesToMerge,
-                                                 const unsigned int maximumNumberOfComponents)
+Trk::QuickCloseComponentsMultiStateMerger::merge(
+  Trk::MultiComponentState&& statesToMerge,
+  const unsigned int maximumNumberOfComponents)
 {
   // Assembler Cache
   MultiComponentStateAssembler::Cache cache;
   if (statesToMerge.size() <= maximumNumberOfComponents) {
-    MultiComponentStateAssembler::addMultiState(cache, std::move(statesToMerge));
+    MultiComponentStateAssembler::addMultiState(cache,
+                                                std::move(statesToMerge));
     return MultiComponentStateAssembler::assembledState(cache);
   }
 
@@ -52,13 +54,14 @@ Trk::QuickCloseComponentsMultiStateMerger::merge(Trk::MultiComponentState&& stat
                 return x.second > y.second;
               });
 
-    Trk::ComponentParameters dummyCompParams(statesToMerge.begin()->first->clone(), 1.);
+    Trk::ComponentParameters dummyCompParams(
+      statesToMerge.begin()->first->clone(), 1.);
     Trk::MultiComponentState returnMultiState;
     returnMultiState.push_back(std::move(dummyCompParams));
     return returnMultiState;
   }
 
-  return mergeFullDistArray(cache, statesToMerge,maximumNumberOfComponents);
+  return mergeFullDistArray(cache, statesToMerge, maximumNumberOfComponents);
 }
 
 Trk::MultiComponentState
@@ -73,7 +76,8 @@ Trk::QuickCloseComponentsMultiStateMerger::mergeFullDistArray(
     const AmgSymMatrix(5)* measuredCov = statesToMerge[i].first->covariance();
     const AmgVector(5)& parameters = statesToMerge[i].first->parameters();
     // Fill in infomation
-    const double cov = measuredCov ? (*measuredCov)(Trk::qOverP, Trk::qOverP) : -1.;
+    const double cov =
+      measuredCov ? (*measuredCov)(Trk::qOverP, Trk::qOverP) : -1.;
     components[i].mean = parameters[Trk::qOverP];
     components[i].cov = cov;
     components[i].invCov = cov > 0 ? 1. / cov : 1e10;
@@ -88,7 +92,8 @@ Trk::QuickCloseComponentsMultiStateMerger::mergeFullDistArray(
   for (const auto& mergePair : merges) {
     const int32_t mini = mergePair.first;
     const int32_t minj = mergePair.second;
-    MultiComponentStateCombiner::combineWithWeight(statesToMerge[mini], statesToMerge[minj]);
+    MultiComponentStateCombiner::combineWithWeight(statesToMerge[mini],
+                                                   statesToMerge[minj]);
     statesToMerge[minj].first.reset();
     statesToMerge[minj].second = 0.;
   }
@@ -98,10 +103,12 @@ Trk::QuickCloseComponentsMultiStateMerger::mergeFullDistArray(
     if (!state.first) {
       continue;
     }
-    cache.multiComponentState.push_back(ComponentParameters(state.first.release(), state.second));
+    cache.multiComponentState.push_back(
+      ComponentParameters(state.first.release(), state.second));
     cache.validWeightSum += state.second;
   }
-  Trk::MultiComponentState mergedState = MultiComponentStateAssembler::assembledState(cache);
+  Trk::MultiComponentState mergedState =
+    MultiComponentStateAssembler::assembledState(cache);
   // Clear the state vector
   statesToMerge.clear();
   return mergedState;