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diff --git a/sys/plio/tf/plr2pl.x b/sys/plio/tf/plr2pl.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<plset.h>
+include	<plio.h>
+
+# PL_R2P -- Convert a range list to a pixel array.  The number of pixels
+# output (always npix) is returned as the function value.
+
+int procedure pl_r2pl (rl_src, xs, px_dst, npix)
+
+long	rl_src[3,ARB]		#I input range list
+int	xs			#I starting pixel index in range list
+long	px_dst[ARB]		#O output pixel array
+int	npix			#I number of pixels to convert
+
+long	hi, pv
+int	xe, x1, x2, iz, op, np, nz, nr, i, j
+define	done_ 91
+
+begin
+	# No input pixels?
+	nr = RL_LEN(rl_src)
+	if (npix <= 0 || nr <= 0)
+	    return (0)
+
+	xe = xs + npix - 1
+	iz = xs
+	op = 1
+	hi = 1
+
+	# Process the array of range lists.
+	do i = RL_FIRST, nr {
+	    x1 = rl_src[1,i]
+	    np = rl_src[2,i]
+	    pv = rl_src[3,i]
+	    x2 = x1 + np - 1
+
+	    # Get an inbounds range.
+	    if (x1 > xe)
+		break
+	    else if (xs > x2)
+		next
+	    else if (x1 < xs)
+		x1 = xs
+	    else if (x2 > xe)
+		x2 = xe
+		
+	    nz = x1 - iz
+	    np = x2 - x1 + 1
+	    if (np <= 0)
+		next
+
+	    # Output range of zeros to catch up to current range?
+	    if (nz > 0) {
+		do j = 1, nz
+		    px_dst[op+j-1] = 0
+		op = op + nz
+	    }
+
+	    # Output the pixels.
+	    do j = 1, np
+		px_dst[op+j-1] = pv
+	    op = op + np
+done_
+	    x1 = x2 + 1
+	    iz = x1
+	}
+
+	# Zero any remaining output range.
+	do i = op, npix
+	    px_dst[i] = 0
+
+	return (npix)
+end