Index: trunk/ippconfig/megacam/ppImage.config
===================================================================
--- trunk/ippconfig/megacam/ppImage.config	(revision 10496)
+++ trunk/ippconfig/megacam/ppImage.config	(revision 11094)
@@ -6,2 +6,35 @@
 OVERSCAN.ORDER		S32	0		# Order of polynomial fit
 OVERSCAN.STAT		STR	MEAN		# MEAN | MEDIAN
+
+# this table lists constraints which should be applied when selecting the
+# detrend images. 
+DETREND.CONSTRAINTS  METADATA
+  BIAS METADATA
+    CAMERA  STR FPA.INSTRUMENT
+    TIME    STR FPA.TIME
+    DETTEMP STR FPA.TEMP
+  END
+  DARK METADATA
+    CAMERA  STR FPA.INSTRUMENT
+    TIME    STR FPA.TIME
+    DETTEMP STR FPA.TEMP
+    EXPTIME STR FPA.EXPTIME
+  END
+  FLAT METADATA
+    CAMERA  STR FPA.INSTRUMENT
+    TIME    STR FPA.TIME
+    FILTER  STR FPA.FILTER
+    VERSION STR RAW
+  END
+  FRINGE
+    CAMERA  STR FPA.INSTRUMENT
+    TIME    STR FPA.TIME
+    FILTER  STR FPA.FILTER
+    AIRMASS STR FPA.AIRMASS
+    TWITIME STR TWILIGHT.TIME
+  END
+  SHUTTER
+    CAMERA  STR FPA.INSTRUMENT
+    TIME    STR FPA.TIME
+  END	
+END