Index: /trunk/psphot/src/psphotApResid.c
===================================================================
--- /trunk/psphot/src/psphotApResid.c	(revision 21174)
+++ /trunk/psphot/src/psphotApResid.c	(revision 21175)
@@ -231,5 +231,5 @@
 
     // construct the fitted values and the residuals
-    psVector *apResidFit = pmTrend2DEvalVector (psf->ApTrend, xPos, yPos);
+    psVector *apResidFit = pmTrend2DEvalVector (psf->ApTrend, mask, 0xff, xPos, yPos);
     psVector *apResidRes = (psVector *) psBinaryOp (NULL, (void *) apResid, "-", (void *) apResidFit);
     psVector *dMagSys = (psVector *) psBinaryOp (NULL, (void *) dMag, "*", (void *) psScalarAlloc(errorScale, PS_TYPE_F32));
@@ -430,5 +430,5 @@
 
     // construct the fitted values and the residuals
-    psVector *apResidFit = pmTrend2DEvalVector (psf->ApTrend, xPos, yPos);
+    psVector *apResidFit = pmTrend2DEvalVector (psf->ApTrend, mask, 0xff, xPos, yPos);
     psVector *apResidRes = (psVector *) psBinaryOp (NULL, (void *) apResid, "-", (void *) apResidFit);