Index: trunk/ppSub/src/ppSub.h
===================================================================
--- trunk/ppSub/src/ppSub.h	(revision 18649)
+++ trunk/ppSub/src/ppSub.h	(revision 20611)
@@ -27,4 +27,10 @@
     );
 
+/// Higher-order background subtraction
+bool ppSubBackground(pmReadout *ro,     ///< Readout of interest
+                     pmConfig *config,  ///< Configuration
+                     const pmFPAview *view ///< View to readout
+    );
+
 /// Put the program version information into a metadata
 void ppSubVersionMetadata(psMetadata *metadata ///< Metadata to populate