Index: trunk/psphot/src/psphotBasicDeblend.c
===================================================================
--- trunk/psphot/src/psphotBasicDeblend.c	(revision 6427)
+++ trunk/psphot/src/psphotBasicDeblend.c	(revision 6481)
@@ -86,5 +86,5 @@
 	threshold = FRACTION * source->moments->Peak;
 	// threshold is no less than NSIGMA above the local median sigma?
-	threshold = PS_MAX (threshold, NSIGMA*source->moments->dSky);
+	threshold = PS_MAX (threshold, NSIGMA*sqrt(source->moments->dSky));
 
 	// generate a basic contour (set of x,y coordinates at-or-below flux level)