diff --git a/compact/erich.xml b/compact/erich.xml
index bc10dab47095515c52391cdd29bf3ab70f542ea8..a930c6c0065ea785a9017250f432c317ef254d11 100644
--- a/compact/erich.xml
+++ b/compact/erich.xml
@@ -156,11 +156,14 @@
   />
 
 <services>
-  <comment> SJJ: random standin for readout + electronics + cooling @FIXME </comment>
+  <comment> 
+    Material should be equivallent with 3x0.5cm Al, spread over the entire available distance.
+    This was confirmed by Silvia.
+  </comment>
   <component name="aluminum" thickness="5*mm" vis="RICHServiceVis" material="Aluminum"/>
-  <component name="air" thickness="20*mm" material="Air"/>
+  <component name="air" thickness="40*mm" vis="InvisibleNoDaughters" material="Air"/>
   <component name="aluminum" thickness="5*mm" vis="RICHServiceVis" material="Aluminum"/>
-  <component name="air" thickness="20*mm" material="Air"/>
+  <component name="air" thickness="40*mm" vis="InvisibleNoDaughters" material="Air"/>
   <component name="aluminum" thickness="5*mm" vis="RICHServiceVis" material="Aluminum"/>
 </services>