diff --git a/compact/electron_tracker.xml b/compact/electron_tracker.xml
index 95a4e6853190fa08c4ebdf220ba142762264689e..75b6e249692e9bcad7b59780606ec0bfd0fe10bc 100644
--- a/compact/electron_tracker.xml
+++ b/compact/electron_tracker.xml
@@ -11,8 +11,8 @@
     
     <constant name="electron_tracker_zoffset"     value="10.0*cm"/>
     <constant name="electron_tracker_length"      value="60.0*cm"/>
-    <constant name="electron_tracker_center_zpos" value="-73.045894*m" />
-    <constant name="electron_tracker_center_xpos" value="0.143335*m"/>
+    <constant name="electron_tracker_center_zpos" value="-54.246022*m" />
+    <constant name="electron_tracker_center_xpos" value="0.07391*m"/>
     <constant name="electron_tracker_zmin"        value="electron_tracker_center_zpos - electron_tracker_length/2.0 "/>
     <constant name="electron_tracker_rotation"    value="-0.0173520834*rad"/>
     <comment>