Index: trunk/ippconfig/gpc1/ppStack.config
===================================================================
--- trunk/ippconfig/gpc1/ppStack.config	(revision 38062)
+++ trunk/ippconfig/gpc1/ppStack.config	(revision 38230)
@@ -357,5 +357,5 @@
 
 
-STACK_MD_PV3_NIGHT_1DG  METADATA   ## Revised MD 8 input NIGHT stacks for PV3 -- not complete
+STACK_MD_PV3_NIGHT_1DG  METADATA   ## Revised MD 8 input NIGHT stacks for PV3 -- no time to test, so similar to original but 1DG 
     OUTPUT.NOCOMP             BOOL  FALSE
     OUTPUT.LOGFLUX            BOOL  FALSE
@@ -365,17 +365,18 @@
     PSF.INPUT.THRESH        F32   NAN
     PSF.INPUT.ASYMMETRY     F32   NAN
-    MATCH.REJ               F32   4.0   # need ot tune?
-    SAFE                    BOOL  FALSE
-    ## 
+    MATCH.REJ               F32   4.0       # need ot tune?
+    SAFE                    BOOL  TRUE      # Play safe when combining small number of values? 
     PSF.TARGET.AS.MAX       BOOL  TRUE      # Set the target PSF FWHM as the maximum of accepted input FWHM values.
     PSF.TARGET.AS.MAX.EPSILON F32 0.1       # Amount to set the target PSF FWHM larger than the maximum input. Target = eps + max(input)
-    THRESHOLD.MASK  F32     0.1             # Threshold for mask deconvolution (0..1)
-    COMBINE.ITER    F32     0.5             # Number of rejection iterations per input
-    COMBINE.REJ     F32     3.0             # Rejection threshold in combination (sigma)
-    COMBINE.SYS     F32     0.1             # Relative systematic error in combination
-    COMBINE.DISCARD F32     0.2             # Discard fraction for Olympic weighted mean
-    IMAGE.REJ       F32     0.1             # Rejected pixel fraction threshold for rejecting entire image
-    NMINPIX         S32     4               # Minimum input per pixel
-    MASK.VAL        STR     SUSPECT,MASK.VALUE,CONV.BAD,GHOST # Mask value of input bad pixels 
+    ## -- extra masking not tested and likely not want for small Nin stack
+    #THRESHOLD.MASK  F32     0.1             # Threshold for mask deconvolution (0..1)
+    #COMBINE.ITER    F32     0.5             # Number of rejection iterations per input
+    #COMBINE.REJ     F32     3.0             # Rejection threshold in combination (sigma)
+    #COMBINE.SYS     F32     0.1             # Relative systematic error in combination
+    #COMBINE.DISCARD F32     0.2             # Discard fraction for Olympic weighted mean
+    #IMAGE.REJ       F32     0.1             # Rejected pixel fraction threshold for rejecting entire image
+    #MASK.VAL        STR     SUSPECT,MASK.VALUE,CONV.BAD,GHOST # Mask value of input bad pixels 
+    ## -- 
+    NMINPIX         S32     1               # Minimum input per pixel
     MASK.BLANKBORDER S32    20              # Mask blank border in final stack output
     BSCALEOFFSET    BOOL    FALSE           # MUST be FALSE for PV3