Index: trunk/MagicSoft/Mars/mbase/MMath.h
===================================================================
--- trunk/MagicSoft/Mars/mbase/MMath.h	(revision 7688)
+++ trunk/MagicSoft/Mars/mbase/MMath.h	(revision 7719)
@@ -17,5 +17,5 @@
     inline Double_t HorToRad() { return 15/TMath::RadToDeg(); }
 
-    Double_t GaussProb(Double_t x, Double_t sigma, Double_t mean=0);
+    Double_t GaussProb(Double_t x, Double_t sigma=1, Double_t mean=0);
 
     Double_t Significance(Double_t s, Double_t b);