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diff --git a/sys/mwcs/mwgaxmap.x b/sys/mwcs/mwgaxmap.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<syserr.h>
+include	"mwcs.h"
+
+# MW_GAXMAP -- Get the axis map.  This assigns a logical axis axno[i] to
+# each physical axis I.  If axno[i]=0, the value of the physical axis
+# coordinate is the constant axval[i], and the dimension of the logical
+# system is reduced by one.
+
+procedure mw_gaxmap (mw, axno, axval, ndim)
+
+pointer	mw			#I pointer to MWCS descriptor
+int	axno[ndim]		#O physical -> logical axis assignments
+int	axval[ndim]		#O value of physical axis if axno=0
+int	ndim			#I physical dimension of axis map
+
+int	i
+errchk	syserrs
+
+begin
+	# Verify dimension.
+	if (MI_NDIM(mw) != ndim)
+	    call syserrs (SYS_MWNDIM, "mw_gaxmap")
+
+	# Copy out the current axis map.
+	do i = 1, ndim {
+	    axno[i] = MI_AXNO(mw,i)
+	    axval[i] = MI_AXVAL(mw,i)
+	}
+end