Index: trunk/ppStack/src/ppStackReadout.c
===================================================================
--- trunk/ppStack/src/ppStackReadout.c	(revision 20497)
+++ trunk/ppStack/src/ppStackReadout.c	(revision 20499)
@@ -230,5 +230,5 @@
     }
 
-    if (!pmStackCombine(outRO, stack, maskVal | maskBad, maskBad, 0, 0, NAN,
+    if (!pmStackCombine(outRO, stack, maskVal | maskBad, maskBad, 0, 0, NAN, NAN,
                         numGood != num, useVariance, false)) {
         psError(PS_ERR_UNKNOWN, false, "Unable to combine input readouts.");