Index: trunk/Ohana/src/relphot/src/setMrelCatalog.c
===================================================================
--- trunk/Ohana/src/relphot/src/setMrelCatalog.c	(revision 41961)
+++ trunk/Ohana/src/relphot/src/setMrelCatalog.c	(revision 42010)
@@ -272,5 +272,8 @@
 
       // the flat-field correction is stored in measure.Mflat
-      Mflat = isnan (measureT[k].Mflat) ? 0.0 : measureT[k].Mflat;
+      //Mflat = isnan (measureT[k].Mflat) ? 0.0 : measureT[k].Mflat;
+      if (measure) {
+        Mflat = isnan (measure[k].Mflat) ? 0.0 : measure[k].Mflat;
+      }
 
       // see note above re: final output vs image analysis