Added Gap Size in Crystal EMCAL

Added a gap size variable in Crystal EMCAL

topside/ecal.xml

@@ -7,6 +7,7 @@
     <constant name="CrystalBox_x_length" value="20.0*mm"/>
     <constant name="CrystalBox_y_length" value="20.0*mm"/>
     <constant name="CrystalBox_z_length" value="200.0*mm"/>
+    <constant name="CrystalBox_offset"   value="0.000001*mm"/>
     <constant name="CrystalEndcap_x_pos" value="0.0*m"/>
     <constant name="CrystalEndcap_y_pos" value="0.0*m"/>
     <constant name="CrystalEndcap_z_pos" value="-EcalEndcap_zmin"/>
@@ -34,11 +35,11 @@
     <detector 
       id="CrystalEndcap_ID" 
       name="ElectronECAL" 
-      type="Crystal" 
+      type="CrystalCalorimeterEndcap" 
       readout="CrystalEcalHits" 
       vis="GreenVis">
       <position x="CrystalEndcap_x_pos" y="CrystalEndcap_y_pos" z="CrystalEndcap_z_pos" />
-      <dimensions rmin="CrystalEndcap_rmin" rmax="CrystalEndcap_rmax" x="CrystalBox_x_length" y="CrystalBox_y_length" z="CrystalBox_z_length"/>
+      <dimensions rmin="CrystalEndcap_rmin" rmax="CrystalEndcap_rmax" x="CrystalBox_x_length" y="CrystalBox_y_length" z="CrystalBox_z_length" delta="CrystalBox_offset"/>
     </detector>
 
     <comment>