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diff --git a/sys/plio/plcreate.x b/sys/plio/plcreate.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# PL_CREATE -- Create an empty mask with the given dimensionality and size.
+# A newly created mask has all line pointers pointing to the empty line,
+# which is stored as the first entry in the line list buffer.
+
+pointer procedure pl_create (naxes, axlen, depth)
+
+int	naxes			#I number of axes (dimensionality of mask)
+long	axlen[ARB]		#I length of each axis
+int	depth			#I mask depth, bits
+
+pointer	pl
+pointer	pl_open()
+errchk	pl_open
+
+begin
+	pl = pl_open (NULL)
+	call pl_ssize (pl, naxes, axlen, depth)
+
+	return (pl)
+end