Index: trunk/psphot/src/psphotMagnitudes.c
===================================================================
--- trunk/psphot/src/psphotMagnitudes.c	(revision 5802)
+++ trunk/psphot/src/psphotMagnitudes.c	(revision 5828)
@@ -37,5 +37,5 @@
       rflux   = pow (10.0, 0.4*source->fitMag);
       source->apMag  -= rflux * psf->skyBias * (M_PI * PS_SQR(apRadius));
-      source->fitMag += psf->ApResid;
+      source->fitMag += psPolynomial3DEval (psf->ApTrend, x, y, 0.0);
     }
 
@@ -70,2 +70,8 @@
     return (model);
 }
+
+/*
+aprMag' - fitMag = rflux*skyBias + ApTrend(x,y)
+(aprMag - rflux*skyBias) - fitMAg = ApTrend(x,y)
+(aprMag - rflux*skyBias) = fitMAg + ApTrend(x,y)
+*/