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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	"icombine.h"
+
+
+# IC_SUM -- Compute the summed image line.
+
+procedure ic_sumr (d, n, npts, sum)
+
+pointer	d[ARB]			# Data pointers
+int	n[npts]			# Number of points
+int	npts			# Number of output points per line
+real	sum[npts]		# Average (returned)
+
+int	i, j, k
+real	s
+
+include	"icombine.com"
+
+begin
+	# If no data has been excluded do the sum without checking the
+	# number of points.  If all the data has been excluded set the
+	# sum to the blank value.
+
+	if (dflag == D_ALL) {
+	    do i = 1, npts {
+		k = i - 1
+		s = Memr[d[1]+k]
+		do j = 2, n[i]
+		    s = s + Memr[d[j]+k]
+		sum[i] = s
+	    }
+	} else if (dflag == D_NONE) {
+	    do i = 1, npts
+		sum[i] = blank
+	} else {
+	    do i = 1, npts {
+		if (n[i] > 0) {
+		    k = i - 1
+		    s = Memr[d[1]+k]
+		    do j = 2, n[i]
+			s = s + Memr[d[j]+k]
+		    sum[i] = s
+		} else
+		    sum[i] = blank
+	    }
+	}
+end