Index: trunk/Mars/hawc/callisto.C
===================================================================
--- trunk/Mars/hawc/callisto.C	(revision 20041)
+++ trunk/Mars/hawc/callisto.C	(revision 20042)
@@ -36,5 +36,5 @@
 
 ******************************************************************/
-int callisto(const char *datafile, const char *drsfile,
+int callisto(const char *datafile, const char *drsfile,  bool ismc,
              const char *outpath=".")
 {
@@ -84,7 +84,10 @@
     MArrayD calib(64);
     calib.Reset(1);
-    calib[33] = 1./0.82;
-    calib[37] = 1./0.82;
-    calib[43] = 1./0.82;
+    if (!ismc)
+    {
+        calib[33] = 1./0.82;
+        calib[37] = 1./0.82;
+        calib[43] = 1./0.82;
+    }
 
     // ------------------------------------------------------