Index: trunk/ippconfig/recipes/reductionClasses.mdc
===================================================================
--- trunk/ippconfig/recipes/reductionClasses.mdc	(revision 41828)
+++ trunk/ippconfig/recipes/reductionClasses.mdc	(revision 42100)
@@ -2062,2 +2062,26 @@
         PSVIDEOPHOT                 STR     PSVIDEOPHOT
 END
+
+# UNIONS DR3 reduction class
+UNIONS_DR3  METADATA
+    CHIP_PPIMAGE                STR     CHIP
+    CHIP_PSPHOT                 STR     CHIP
+    WARP_PSWARP                 STR     WARP
+    STACK_PPSTACK               STR     STACK_UNIONS_DR3
+    STACK_PPSUB                 STR     STACK
+    STACK_PSPHOT                STR     STACK
+    DIFF_PPSUB	                STR	DIFF
+    DIFF_PSPHOT	                STR	DIFF
+    JPEG_BIN1                   STR     PPIMAGE_J1
+    JPEG_BIN2                   STR     PPIMAGE_J2
+    FAKEPHOT                    STR     FAKEPHOT
+    ADDSTAR                     STR     ADDSTAR
+    PSASTRO                     STR     DEFAULT_RECIPE
+    STACKPHOT_PSPHOT            STR     UNIONS_DR3
+    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
+END