Index: trunk/psModules/src/imcombine/pmSubtraction.h
===================================================================
--- trunk/psModules/src/imcombine/pmSubtraction.h	(revision 25279)
+++ trunk/psModules/src/imcombine/pmSubtraction.h	(revision 26893)
@@ -113,5 +113,6 @@
                            psImageMaskType maskPoor, ///< Mask value to give poor pixels
                            float poorFrac, ///< Fraction for "poor"
-                           float sysError, ///< Relative systematic error
+                           float kernelError, ///< Relative systematic error in kernel
+                           float covarFrac,  ///< Truncation fraction for kernel before covariance calculation
                            const psRegion *region, ///< Region to convolve (or NULL)
                            const pmSubtractionKernels *kernels, ///< Kernel parameters
@@ -127,4 +128,11 @@
     );
 
+/// Return normalised coordinates
+void p_pmSubtractionPolynomialNormCoords(
+    float *xOut, float *yOut,           ///< Normalised coordinates, returned
+    float xIn, float yIn,               ///< Input coordinates
+    int xMin, int xMax, int yMin, int yMax ///< Bounds of validity
+    );
+
 /// Given (normalised) coordinates (x,y), generate a matrix where the elements (i,j) are x^i * y^j
 psImage *p_pmSubtractionPolynomial(psImage *output, ///< Output matrix, or NULL
@@ -138,5 +146,4 @@
 psImage *p_pmSubtractionPolynomialFromCoords(psImage *output, ///< Output matrix, or NULL
                                              const pmSubtractionKernels *kernels, ///< Kernel parameters
-                                             int numCols, int numRows, ///< Size of image of interest
                                              int x, int y ///< Position of interest
     );