Index: trunk/ippconfig/recipes/ppStack.config
===================================================================
--- trunk/ippconfig/recipes/ppStack.config	(revision 41705)
+++ trunk/ippconfig/recipes/ppStack.config	(revision 41898)
@@ -8,4 +8,8 @@
 COMBINE.SYS	F32	0.1		# Relative systematic error in combination
 COMBINE.DISCARD	F32	0.2		# Discard fraction for Olympic weighted mean
+
+COMBINE.PERCENT   BOOL  FALSE           # Use a single percentile clipping?
+COMBINE.MIN.RANGE F32   0.16            # Minimum fraction for percentile clipping
+COMBINE.MAX.RANGE F32   0.84            # Maximum fraction for percentile clipping
 
 MASK.VAL	STR	MASK.VALUE,CONV.BAD,GHOST # Mask value of input bad pixels