Index: trunk/MagicSoft/Mars/mpedestal/MPedCalcPedRun.cc
===================================================================
--- trunk/MagicSoft/Mars/mpedestal/MPedCalcPedRun.cc	(revision 4011)
+++ trunk/MagicSoft/Mars/mpedestal/MPedCalcPedRun.cc	(revision 4012)
@@ -403,5 +403,5 @@
           fWindowSizeLoGain += fWindowSizeHiGain;
           fWindowSizeHiGain  = 0;
-          fLoGainFirst       = diff-1;
+          fLoGainFirst       = diff-fWindowSizeHiGain;
         }
     }