adding configurable number of seed layers

MuonSpectrometer/MuonReconstruction/MuonSegmentMakers/MuonSegmentMakerTools/DCMathSegmentMaker/src/MuonClusterSegmentFinderTool.cxx

@@ -27,6 +27,7 @@ MuonClusterSegmentFinderTool::MuonClusterSegmentFinderTool(const std::string& ty
     //
     declareProperty("IPConstraint", m_ipConstraint = true);
     declareProperty("ClusterDistance", m_maxClustDist = 5);
+    declareProperty("NOfSeedLayers", m_nOfSeedLayers=1);
 }
 
 StatusCode
@@ -547,11 +548,11 @@ MuonClusterSegmentFinderTool::segmentSeed(std::vector<std::vector<const Muon::Mu
 {
 
     std::vector<std::pair<Amg::Vector3D, Amg::Vector3D> > seeds;
-    if (orderedClusters.size() < 2) return seeds;
+    if (orderedClusters.size() < 4) return seeds;
 
     // calculate the straight line between the two furthest points
     int seedlayers1 = 0;
-    for (unsigned int i = 0; (i < orderedClusters.size() && seedlayers1 < 2); ++i) {
+    for (unsigned int i = 0; (i < orderedClusters.size() && seedlayers1 < m_nOfSeedLayers); ++i) {
 
         bool usedLayer1 = false;
         for (std::vector<const Muon::MuonClusterOnTrack*>::const_iterator cit = orderedClusters[i].begin();
@@ -563,7 +564,7 @@ MuonClusterSegmentFinderTool::segmentSeed(std::vector<std::vector<const Muon::Mu
             const Amg::Vector3D& gp1 = (*cit)->prepRawData()->globalPosition();
 
             int seedlayers2 = 0;
-            for (unsigned int k = orderedClusters.size() - 1; (k > i && seedlayers2 < 2); --k) {
+            for (unsigned int k = orderedClusters.size() - 1; (k > i && seedlayers2 < m_nOfSeedLayers); --k) {
 
                 bool usedLayer2 = false;
                 for (std::vector<const Muon::MuonClusterOnTrack*>::const_iterator cit2 = orderedClusters[k].begin();