Index: trunk/MagicSoft/Mars/msignal/MArrivalTime.h
===================================================================
--- trunk/MagicSoft/Mars/msignal/MArrivalTime.h	(revision 4714)
+++ trunk/MagicSoft/Mars/msignal/MArrivalTime.h	(revision 4716)
@@ -40,5 +40,6 @@
     const TArrayF &GetDataErr() const { return fDataErr; }
 
-    Double_t operator[](int i) { return fData[i]; }
+    Double_t operator[](int i)       { return fData[i]; }
+    Double_t operator[](int i) const { return fData[i]; }
 
     // Do not do such things! It is highly dangerous to use two very similar operators