Index: trunk/psphot/src/psphotStackChisqImage.c
===================================================================
--- trunk/psphot/src/psphotStackChisqImage.c	(revision 30624)
+++ trunk/psphot/src/psphotStackChisqImage.c	(revision 31154)
@@ -101,7 +101,9 @@
         for (int ix = 0; ix < inImage->numCols; ix++) {
 	    if (inMask->data.PS_TYPE_IMAGE_MASK_DATA[iy][ix] & maskVal) continue;
-	    chiImage->data.F32[iy][ix] += PS_SQR(inImage->data.F32[iy][ix]) / inVariance->data.F32[iy][ix];
+	    // XXX TEST chiImage->data.F32[iy][ix] += PS_SQR(inImage->data.F32[iy][ix]) / inVariance->data.F32[iy][ix];
+	    chiImage->data.F32[iy][ix] = 0.0;
 	    chiVariance->data.F32[iy][ix] = 1.0; // ?? what is the right value?  just init to this?
-	    chiMask->data.PS_TYPE_IMAGE_MASK_DATA[iy][ix] = 0x00; // we have valid data so unmask this pixel
+	    // XXX TEST chiMask->data.PS_TYPE_IMAGE_MASK_DATA[iy][ix] = 0x00; // we have valid data so unmask this pixel
+	    chiMask->data.PS_TYPE_IMAGE_MASK_DATA[iy][ix] = 0x01; // we have valid data so unmask this pixel
         }
     }