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diff --git a/noao/digiphot/photcal/lib/mctable.h b/noao/digiphot/photcal/lib/mctable.h
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+# Multicolumn table structure.
+
+# Pointer Mem
+define	MEMP	Memi
+
+# Magic number
+define	MAGIC		1989
+
+# Growing factor computation. This formula is used to compute
+# the increment is memory allocation in terms of the memory
+# already allocated, but avoiding a zero or a large factor.
+# The real number in the formula represents the fraction to grow,
+# and it should be greater than zero and less than one, although
+# the formula takes care of out of range values.
+define	GROWFACTOR	min (max (int ($1 * 0.5), 1), $1)	# 50%
+
+# Multi-column table structure
+define	LEN_MCTABLE	10			# structure size
+define	MCT_MAGIC	Memi[$1+0]		# magic number
+define	MCT_TYPE	Memi[$1+1]		# table data type
+define	MCT_MAXROW	Memi[$1+2]		# max number of rows (growing)
+define	MCT_MAXCOL	Memi[$1+3]		# max number of columns (fixed)
+define	MCT_INCROWS	Memi[$1+4]		# row growing increment
+define	MCT_NPROWS	Memi[$1+5]		# highest row entered
+define	MCT_NPCOLS	Memi[$1+6]		# highest column entered
+define	MCT_NGROWS	Memi[$1+7]		# highest row gotten
+define	MCT_NGCOLS	Memi[$1+8]		# highest column gotten
+define	MCT_DATA	MEMP[$1+9]		# data buffer pointer