Index: trunk/MagicSoft/Mars/mpedestal/MPedCalcPedRun.cc
===================================================================
--- trunk/MagicSoft/Mars/mpedestal/MPedCalcPedRun.cc	(revision 4005)
+++ trunk/MagicSoft/Mars/mpedestal/MPedCalcPedRun.cc	(revision 4006)
@@ -397,5 +397,8 @@
         fWindowSizeHiGain -= diff;
       else
-        fWindowSizeLoGain += fWindowSizeHiGain;
+        {
+          fWindowSizeLoGain += fWindowSizeHiGain;
+          fWindowSizeHiGain = 0;
+        }
     }