Index: trunk/psModules/src/objects/pmSourceMoments.c
===================================================================
--- trunk/psModules/src/objects/pmSourceMoments.c	(revision 32347)
+++ trunk/psModules/src/objects/pmSourceMoments.c	(revision 33838)
@@ -319,14 +319,14 @@
     }
 
-    source->moments->Mrf = RF/RS;
     source->moments->Mrh = RH/RS;
 
-    // if Mrf (first radial moment) is very small, we are getting into low-significance
+    // if Mrf = RF/RS (first radial moment) is very small, we are getting into low-significance
     // territory.  saturate at minKronRadius.  conversely, if Mrf is >> radius for faint
     // sources, we are clearly making an error.  saturate at radius.
-    float kronRefRadius = MAX(minKronRadius, source->moments->Mrf);
+    float kronRefRadius = MAX(minKronRadius, RF/RS);
     if (source->moments->SN < 10) {
 	kronRefRadius = MIN(radius, kronRefRadius);
     }
+    source->moments->Mrf = kronRefRadius;
 
     // *** now calculate the kron flux values using the 1st radial moment