Index: /branches/eam_branches/ipp-20230313/ippconfig/recipes/ppStack.config
===================================================================
--- /branches/eam_branches/ipp-20230313/ippconfig/recipes/ppStack.config	(revision 42641)
+++ /branches/eam_branches/ipp-20230313/ippconfig/recipes/ppStack.config	(revision 42642)
@@ -239,4 +239,21 @@
 END
 
+XCSTACK_UNIONS_DR4 METADATA
+  CONVOLVE          BOOL  FALSE           # Convolve images when stacking?
+  MATCH.ZERO.POINTS BOOL  TRUE            # Convolve images when stacking?
+  
+  COMBINE.ITER    F32     0.0             # Number of rejection iterations per input
+  COMBINE.REJ     F32    10.0             # Rejection threshold in combination (sigma)
+  COMBINE.SYS     F32     0.1             # Relative systematic error in combination
+  COMBINE.DISCARD F32     0.0             # Discard fraction for Olympic weighted mean
+  
+  COMBINE.PERCENT         BOOL  TRUE      # Use a single percentile clipping?
+  COMBINE.REJECT.FRACTION F32   0.0       # fraction of outliers to reject in percentile clipping
+  
+  SKIP.MISSING.INPUTS BOOL FALSE          # If some input warp images are missing, make the stack anyway
+  
+  SKIP.BG.SUB     BOOL    TRUE            # Bypass background subtraction?
+END
+
 TEST1 METADATA
   CONVOLVE          BOOL  FALSE           # Convolve images when stacking?
Index: /branches/eam_branches/ipp-20230313/ippconfig/recipes/reductionClasses.mdc
===================================================================
--- /branches/eam_branches/ipp-20230313/ippconfig/recipes/reductionClasses.mdc	(revision 42641)
+++ /branches/eam_branches/ipp-20230313/ippconfig/recipes/reductionClasses.mdc	(revision 42642)
@@ -179,13 +179,13 @@
 	STACKPHOT_PPSUB   STR     STACKPHOT
 	STACKPHOT_PPSTACK STR     STACKPHOT
-	STACKPHOT_SINGLE_PSPHOT  STR     STACKPHOT_SINGLE
-	BACKGROUND_PPBACKGROUND	STR	BACKGROUND
-	BACKGROUND_PSWARP	STR	BACKGROUND
-        PSVIDEOPHOT             STR     PSVIDEOPHOT
-        STATICSKY_CALIBRATION   STR     STATICSKY_CAL
-        FULLFORCE_PSPHOT  STR   FULLFORCE_WARP
-        FPCAMERA          STR   DEFAULT_RECIPE
-	XCSTACK_PPSTACK	  STR	TEST1
-	XCSTACK_PSPHOT	  STR	STACKPHOT_SINGLE
+	STACKPHOT_SINGLE_PSPHOT   STR     STACKPHOT_SINGLE
+	BACKGROUND_PPBACKGROUND	  STR	BACKGROUND
+	BACKGROUND_PSWARP	  STR	BACKGROUND
+        PSVIDEOPHOT               STR     PSVIDEOPHOT
+        STATICSKY_CALIBRATION     STR     STATICSKY_CAL
+        FULLFORCE_PSPHOT  STR     FULLFORCE_WARP
+        FPCAMERA          STR     DEFAULT_RECIPE
+	XCSTACK_PPSTACK	  STR	  XCSTACK_UNIONS_DR4
+	XCSTACK_PSPHOT	  STR	  STACKPHOT_SINGLE
 END
 
@@ -2142,3 +2142,5 @@
     BACKGROUND_PSWARP           STR     BACKGROUND
     PSVIDEOPHOT                 STR     PSVIDEOPHOT
-END
+    XCSTACK_PPSTACK	        STR	XCSTACK_UNIONS_DR4
+    XCSTACK_PSPHOT	        STR	STACKPHOT_SINGLE
+END