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diff --git a/noao/digiphot/photcal/lib/prdefs.h b/noao/digiphot/photcal/lib/prdefs.h
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+# PRDEFS.H -- Parser definitions.
+
+
+# ----------------------------------------------------------------------
+# Severity error codes.
+define	PERR_WARNING	1		# warning
+define	PERR_SYNTAX	2		# syntax error
+define	PERR_SEMANTIC	3		# semantic error
+define	PERR_POSTPROC	4		# post processing error
+
+
+# ----------------------------------------------------------------------
+# Equation sections. Equations are divided in sections by the parser, to
+# take different semantic actions over expressions depending on the section.
+
+define	PRS_SETEQ	1		# beginning of set equation
+
+define	PRS_TRNREF	2		# transformation reference equation
+define	PRS_TRNFIT	3		# transformation fitting equation
+define	PRS_TRNDER	4		# transformation derivative equations
+define	PRS_TRNPLOT	5		# transformation plot equations
+
+define	PRS_ERREQ	6		# error equation
+define	PRS_WTSEQ	7		# weight equation
+define	PRS_LMTEQ	8		# limit equations
+
+# -------------------------------------------------------------------------
+# Define some default parameter values
+
+define	DEF_PFITDELTA	0.1