Index: trunk/psModules/src/imcombine/pmSubtractionMatch.h
===================================================================
--- trunk/psModules/src/imcombine/pmSubtractionMatch.h	(revision 18287)
+++ trunk/psModules/src/imcombine/pmSubtractionMatch.h	(revision 18962)
@@ -15,4 +15,5 @@
 #define PM_SUBTRACTION_ANALYSIS_STAMPS_NUM "SUBTRACTION.NUM"// Name of the number of stamps in the analysis MD
 #define PM_SUBTRACTION_ANALYSIS_VARFACTOR "SUBTRACTION.VARFACTOR"// Name of variance factor in the analysis MD
+
 
 /// Match two images
@@ -51,7 +52,22 @@
     );
 
+/// Execute a thread job to measure the PSF width ratios
+bool pmSubtractionOrderThread(const psThreadJob *job ///< Job to execute
+    );
+
+/// Measure the PSF width ratio for a single stamp
+bool pmSubtractionOrderStamp(psVector *ratios, ///< PSF width ratios
+                             psVector *mask, ///< Mask for PSF width ratios
+                             const pmSubtractionStampList *stamps, ///< List of stamps
+                             const psArray *models, ///< Pre-calculated gaussian models
+                             const psVector *modelSums, ///< Pre-calculated gaussian model sums
+                             int index, ///< Index of stamp
+                             float bg1, ///< Background for image 1
+                             float bg2  ///< Background for image 2
+    );
+
 /// Determine which image to convolve
 pmSubtractionMode pmSubtractionOrder(pmSubtractionStampList *stamps, ///< Stamps that have been extracted
-                                     float bg1, float bg2 // Background for each image
+                                     float bg1, float bg2 ///< Background for each image
     );