Index: trunk/psModules/src/imcombine/pmSubtractionKernels.h
===================================================================
--- trunk/psModules/src/imcombine/pmSubtractionKernels.h	(revision 30622)
+++ trunk/psModules/src/imcombine/pmSubtractionKernels.h	(revision 35771)
@@ -22,4 +22,9 @@
     } \
     if ((KERNELS)->type == PM_SUBTRACTION_KERNEL_ISIS_RADIAL) { \
+        PS_ASSERT_VECTOR_NON_NULL((KERNELS)->widths, RETURNVALUE); \
+        PS_ASSERT_VECTOR_TYPE((KERNELS)->widths, PS_TYPE_F32, RETURNVALUE); \
+        PS_ASSERT_VECTOR_SIZE((KERNELS)->widths, (KERNELS)->num, RETURNVALUE); \
+    } \
+    if ((KERNELS)->type == PM_SUBTRACTION_KERNEL_SIMPLE) { \
         PS_ASSERT_VECTOR_NON_NULL((KERNELS)->widths, RETURNVALUE); \
         PS_ASSERT_VECTOR_TYPE((KERNELS)->widths, PS_TYPE_F32, RETURNVALUE); \
@@ -71,4 +76,10 @@
 }
 
+// Generate 1D convolution kernel for SIMPLE
+psVector *pmSubtractionKernelSIMPLE(float sigma, // Gaussian width
+				    int order,   // Unused polynomial order
+				    int size     // Kernel half-size
+				    );
+
 // Generate 1D convolution kernel for ISIS
 psVector *pmSubtractionKernelISIS(float sigma, // Gaussian width