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diff --git a/sys/imio/impmsnev.x b/sys/imio/impmsnev.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<imhdr.h>
+include	<imio.h>
+
+# IM_PMSNEV -- Test if a mask image section is nonempty.
+
+bool procedure im_pmsnev (im, vs, ve, ndim)
+
+pointer	im			#I image descriptor
+long	vs[IM_MAXDIM]		#I vector coordinates of start of section
+long	ve[IM_MAXDIM]		#I vector coordinates of end of section
+int	ndim			#I dimensionality of section
+
+bool	pm_sectnotempty()
+
+begin
+	return (pm_sectnotempty (IM_PL(im), vs, ve, ndim))
+end