Index: trunk/Mars/mjobs/MJSimulation.cc
===================================================================
--- trunk/Mars/mjobs/MJSimulation.cc	(revision 17197)
+++ trunk/Mars/mjobs/MJSimulation.cc	(revision 17198)
@@ -677,5 +677,9 @@
     write3af.AddContainer("IntendedPulsePos", "RunHeaders");
     write3af.AddContainer("MRawEvtData",      "Events");
-    write3af.AddContainer("MMcEvtBasic",      "Events");
+    
+    if (fOperationMode == kModeData){
+	write3af.AddContainer("MMcEvtBasic",      "Events");
+    }
+ 
     write3af.AddContainer("MPhotonEvent","Events");