Index: branches/rel-0-8/psphot/src/psphotEvalPSF.c
===================================================================
--- branches/rel-0-8/psphot/src/psphotEvalPSF.c	(revision 11640)
+++ branches/rel-0-8/psphot/src/psphotEvalPSF.c	(revision 12342)
@@ -114,4 +114,6 @@
 
     SN  = model->params->data.F32[PM_PAR_I0]/model->dparams->data.F32[PM_PAR_I0];
+    SN *= sqrt(model->chisqNorm/model->chisq);	// allow for bad measured chisq
+
     SX  = model->params->data.F32[PM_PAR_SXX];
     SY  = model->params->data.F32[PM_PAR_SYY];