diff --git a/topside/ecal_wAstroPixSiW.xml b/topside/ecal_wAstroPixSiW.xml
index 4db29c8f7e26c076f186ffca21cf23233efe9427..28962e96b8cf35dbc2b97ff4ef86991267fe3657 100644
--- a/topside/ecal_wAstroPixSiW.xml
+++ b/topside/ecal_wAstroPixSiW.xml
@@ -93,7 +93,7 @@
         <slice material="TungstenDens24" thickness="EcalBarrelAstroPix_TungstenThickness3"/>
         <slice material="Air" thickness="EcalBarrelAstroPix_LayerSpacing - EcalBarrelAstroPix_TungstenThickness3"/>
       </layer> -->
-      <layer repeat="25">
+      <layer repeat="20">
         <slice material="Silicon" thickness="EcalBarrelAstroPix_SiliconThickness" sensitive="yes" limits="cal_limits"/>
         <slice material="Silicon" thickness="EcalBarrelAstroPix_ElectronicsThickness"/>
         <slice material="Copper" thickness="EcalBarrelAstroPix_CopperThickness"/>
diff --git a/topside/topside_defs.xml b/topside/topside_defs.xml
index 24f660b6c58583de1ebe5b444c21934e72707e0c..8b389af8473c12ee4f132843bd432a33702946e8 100644
--- a/topside/topside_defs.xml
+++ b/topside/topside_defs.xml
@@ -393,7 +393,7 @@
     <constant name="EcalBarrelAstroPix_RMin" value="EcalBarrel_rmin" />
     <constant name="EcalBarrelAstroPix_Length" value="EcalBarrelLength"/>
 
-    <constant name="EcalBarrelAstroPix_SiliconThickness" value="500*um"/>
+    <constant name="EcalBarrelAstroPix_SiliconThickness" value="2000*um"/>
     <constant name="EcalBarrelAstroPix_ElectronicsThickness" value="150*um"/>
     <constant name="EcalBarrelAstroPix_CopperThickness" value="100*um"/>
     <constant name="EcalBarrelAstroPix_KaptonThickness" value="200*um"/>
@@ -407,7 +407,6 @@
     <constant name="EcalBarrelAstroPix_TungstenThickness3" value="3.0*mm"/>
     <constant name="EcalBarrelAstroPix_TungstenThickness4" value="4.0*mm"/>
     <constant name="EcalBarrelAstroPix_TungstenThickness5" value="5.0*mm"/>
-
     <constant name="EcalBarrelAstroPix_ModRepeat" value="CaloSides"/> <comment> originally it was set to 8 </comment>
     <constant name="EcalBarrelAstroPix_ModLength" value="0.5*m"/>
     <constant name="EcalBarrelAstroPix_ModWidth" value="0.5*m"/>