Index: trunk/psModules/src/imcombine/pmSubtractionMatch.h
===================================================================
--- trunk/psModules/src/imcombine/pmSubtractionMatch.h	(revision 26035)
+++ trunk/psModules/src/imcombine/pmSubtractionMatch.h	(revision 26893)
@@ -39,6 +39,9 @@
                         int iter,       ///< Rejection iterations
                         float rej,      ///< Rejection threshold
+                        float normFrac, ///< Fraction of flux in window for normalisation window
                         float sysError, ///< Relative systematic error in images
+                        float skyError, ///< Relative systematic error in images
                         float kernelError, ///< Relative systematic error in kernel
+                        float covarFrac,   ///< Fraction for kernel truncation before covariance calculation
                         psImageMaskType maskVal, ///< Value to mask for input
                         psImageMaskType maskBad, ///< Mask for output bad pixels
@@ -57,4 +60,5 @@
                                int stride, ///< Size for convolution patches
                                float kernelError, ///< Relative systematic error in kernel
+                               float covarFrac,   ///< Fraction for kernel truncation before covariance calc.
                                psImageMaskType maskVal, ///< Value to mask for input
                                psImageMaskType maskBad, ///< Mask for output bad pixels
@@ -94,3 +98,16 @@
     );
 
+
+/// Scale subtraction parameters according to the FWHMs of the inputs
+bool pmSubtractionParamsScale(
+    int *kernelSize,                    ///< Half-size of the kernel
+    int *stampSize,                     ///< Half-size of the stamp (footprint)
+    psVector *widths,                   ///< ISIS widths
+    float fwhm1, float fwhm2,           ///< FWHMs for inputs
+    float scaleRef,                     ///< Reference width for scaling
+    float scaleMin,                     ///< Minimum scaling ratio, or NAN
+    float scaleMax                      ///< Maximum scaling ratio, or NAN
+    );
+
+
 #endif