diff --git a/External/FWDet/TwissFiles/CMakeLists.txt b/External/FWDet/TwissFiles/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..20aa70f068921e4d31fab9167d0c68748567abe9
--- /dev/null
+++ b/External/FWDet/TwissFiles/CMakeLists.txt
@@ -0,0 +1,41 @@
+# Declare the name of the package:
+atlas_subdir( TwissFiles )
+
+# If we are in release rebuilding mode, stop here:
+if( ATLAS_RELEASE_MODE )
+   return()
+endif()
+
+# Find the ATLAS TwissFiles area:
+if( NOT SITEROOT )
+   if( ENV{SITEROOT} )
+      set( SITEROOT $ENV{SITEROOT} )
+   else()
+      set( SITEROOT "/afs/cern.ch" )
+   endif()
+endif()
+if( NOT ATLAS_TWISSFILES )
+   if( ENV{ATLAS_TWISSFILES} )
+      set( ATLAS_TWISSFILES $ENV{ATLAS_TWISSFILES} )
+   else()
+      set( ATLAS_TWISSFILES "${SITEROOT}/atlas/offline/external/TwissFiles" )
+   endif()
+endif()
+
+# The current release data version:
+set( TwissFiles_native_version "v003" )
+
+# Set up a dependency on the separately built RPM file holding this
+# data:
+set_property( GLOBAL APPEND PROPERTY ATLAS_EXTERNAL_RPMS
+   "ATLAS_TwissFiles_${TwissFiles_native_version}" )
+
+# Configure the environment setup module:
+configure_file(
+   ${CMAKE_CURRENT_SOURCE_DIR}/TwissFilesEnvironmentConfig.cmake.in
+   ${CMAKE_CURRENT_BINARY_DIR}/TwissFilesEnvironmentConfig.cmake
+   @ONLY )
+# And now "find" it:
+set( TwissFilesEnvironment_DIR ${CMAKE_CURRENT_BINARY_DIR}
+   CACHE PATH "Location of TwissFilesEnvironmentConfig.cmake" )
+find_package( TwissFilesEnvironment )
diff --git a/External/FWDet/TwissFiles/TwissFilesEnvironmentConfig.cmake.in b/External/FWDet/TwissFiles/TwissFilesEnvironmentConfig.cmake.in
new file mode 100644
index 0000000000000000000000000000000000000000..525916e215c08abfc54bc309ebee6ce056de4c0d
--- /dev/null
+++ b/External/FWDet/TwissFiles/TwissFilesEnvironmentConfig.cmake.in
@@ -0,0 +1,14 @@
+# This file takes care of setting up environment variables for accessing the
+# Twiss files.
+#
+
+# Set the environment variable(s):
+set( TWISSFILESENVIRONMENT_ENVIRONMENT
+   SET SITEROOT "@SITEROOT@"
+   SET ATLAS_TWISSFILES "@ATLAS_TWISSFILES@"
+   FORCESET TwissFilesPATH
+   "\${ATLAS_TWISSFILES}/@TwissFiles_native_version@"
+   APPEND DATAPATH
+   "\${ATLAS_TWISSFILES}/@TwissFiles_native_version@" )
+
+# Silently declare the module found:
\ No newline at end of file
diff --git a/External/FWDet/TwissFiles/cmt/requirements b/External/FWDet/TwissFiles/cmt/requirements
new file mode 100644
index 0000000000000000000000000000000000000000..bd139f62f3ee7e3cac0dc5e48e7b21ac13346b0c
--- /dev/null
+++ b/External/FWDet/TwissFiles/cmt/requirements
@@ -0,0 +1,16 @@
+package TwissFiles
+
+author Tom Sykora tomas.sykora@cern.ch
+
+use ExternalPolicy ExternalPolicy-* External
+
+macro TwissFiles_home "${SITEROOT}/atlas/offline/external/TwissFiles"
+
+apply_pattern install_external_home
+
+macro TwissFiles_native_version "v003"
+macro TwissFiles_export_paths "$(TwissFiles_home)/${TwissFiles_native_version}"
+macro TwissFiles_follow_symlinks "" PACK yes  ////IF THERE ARE SYMLINKS in the _export_paths macros; not our case now 
+set TwissFilesPATH "$(TwissFiles_installed_home)/$(TwissFiles_native_version)"
+
+macro TwissFiles_platform "" PACK noarch /// TO BE PLATFORM INDPENDENT