diff --git a/compact/definitions.xml b/compact/definitions.xml
index 000fc593905b2bd9058950af1fe3c4c82771e63d..d6985682b8faea0355e482bddc6019f2499c1680 100644
--- a/compact/definitions.xml
+++ b/compact/definitions.xml
@@ -585,8 +585,9 @@
       --------------------------
       Central Ion HCal Parameters
       --------------------------
+
     </comment>
-    <constant name="ci_HCAL_id"      value="1"/>
+    <constant name="ci_HCAL_id"      value="200"/>
     <constant name="ci_HCAL_rin"     value="0 * cm"/>
     <constant name="ci_HCAL_rout"    value="300 * cm"/>
     <constant name="ci_HCAL_sizez"   value="160 * cm"/>
@@ -604,7 +605,7 @@
       Central Ion GEM Parameters
       --------------------------
     </comment>
-    <constant name="ci_GEM_id"      value="1"/>
+    <constant name="ci_GEM_id"      value="201"/>
     <constant name="ci_GEM_rin"     value="10 * cm"/>
     <constant name="ci_GEM_rout"    value="95 * cm"/>
     <constant name="ci_GEM_sizez"   value="30 * cm"/>
@@ -612,7 +613,7 @@
     <constant name="ci_GEM_posz"    value="0 * cm"/>
     <constant name="ci_GEM_posx"    value="0 * cm"/>
     <constant name="ci_GEM_nlayers" value="8"/>
-    
+
 
 
 >>>>>>> 57cf00b (Changed .xml files and ci_GEM.cpp)