Index: /trunk/psModules/src/imcombine/pmSubtractionKernels.c
===================================================================
--- /trunk/psModules/src/imcombine/pmSubtractionKernels.c	(revision 13382)
+++ /trunk/psModules/src/imcombine/pmSubtractionKernels.c	(revision 13383)
@@ -88,5 +88,5 @@
     }
 
-    kernels->subIndex = num / 2;
+    kernels->subIndex = (num - (spatialOrder + 1) * (spatialOrder + 2) / 2) / 2;
     assert(kernels->u->data.S32[kernels->subIndex] == 0 &&
            kernels->v->data.S32[kernels->subIndex] == 0 &&
@@ -168,5 +168,5 @@
     }
 
-    kernels->subIndex = (spatialOrder + 1) * (spatialOrder + 2) / 4;
+    kernels->subIndex = 0;
     assert(kernels->u->data.S32[kernels->subIndex] == 0 &&
            kernels->v->data.S32[kernels->subIndex] == 0 &&