Index: /trunk/psModules/src/imcombine/pmSubtractionStamps.c
===================================================================
--- /trunk/psModules/src/imcombine/pmSubtractionStamps.c	(revision 15262)
+++ /trunk/psModules/src/imcombine/pmSubtractionStamps.c	(revision 15263)
@@ -523,5 +523,5 @@
         for (int v = -size; v <= size; v++) {
             for (int u = -size; u <= size; u++) {
-                float z = (PS_SQR(x + xStamp) + PS_SQR(y + yStamp)) / (2.0 * PS_SQR(sigma));
+                float z = (PS_SQR(u + xStamp) + PS_SQR(v + yStamp)) / (2.0 * PS_SQR(sigma));
                 input->kernel[v][u] = flux / sigma * 0.5 * M_2_SQRTPI * M_SQRT1_2 / (1.0 + z + PS_SQR(z));
             }