Index: trunk/ippconfig/tc3/format.config
===================================================================
--- trunk/ippconfig/tc3/format.config	(revision 15064)
+++ trunk/ippconfig/tc3/format.config	(revision 15095)
@@ -15,4 +15,5 @@
 	FPA.NAME	STR	OBSTYPE	# A PHU keyword for unique identifier
 	CONTENT	        STR     DETECTOR # How to determine content of FITS file
+	CONTENT.RULE	STR	{CHIP.NAME}	# How to derive the CONTENT when writing
 END