Index: trunk/ppMerge/src/ppMergeBackground.h
===================================================================
--- trunk/ppMerge/src/ppMergeBackground.h	(revision 7001)
+++ trunk/ppMerge/src/ppMergeBackground.h	(revision 7061)
@@ -2,7 +2,10 @@
 #define PP_MERGE_BACKGROUND_H
 
-// Get the background for each chip of each input
-psImage *ppMergeBackground(const ppMergeOptions *options, // The options
-                           const pmConfig *config // The configuration
+// Get the scale and zero for each chip of each input
+bool ppMergeScaleZero(ppImage **scales, // The scales for each integration/cell
+                      ppImage **zeros, // The zeroes for each integration/cell
+                      ppMergeData *data,// The data
+                      const ppMergeOptions *options, // The options
+                      const pmConfig *config // The configuration
     );