Index: trunk/psastro/src/psastroMosaicGradients.c
===================================================================
--- trunk/psastro/src/psastroMosaicGradients.c	(revision 13656)
+++ trunk/psastro/src/psastroMosaicGradients.c	(revision 15258)
@@ -61,6 +61,6 @@
         for (int j = 0; j <= fpa->toTPA->x->nY; j++) {
             if (i + j > order) {
-		fpa->toTPA->x->mask[i][j] = 1;
-		fpa->toTPA->y->mask[i][j] = 1;
+		fpa->toTPA->x->coeffMask[i][j] = PS_POLY_MASK_SET;
+		fpa->toTPA->y->coeffMask[i][j] = PS_POLY_MASK_SET;
             }
         }