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diff --git a/noao/twodspec/multispec/setranges.x b/noao/twodspec/multispec/setranges.x
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+++ b/noao/twodspec/multispec/setranges.x
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+include "ms.h"
+
+# SET_RANGES -- Set profile starting range array.
+#
+# The ranges array relates the starting point of the profiles relative
+# to the center of profile and relative to the image line.  For more
+# details see the MULTISPEC system documentation.
+
+procedure set_ranges (ms, lower, ranges, nspectra)
+
+pointer	ms				# MULTISPEC data structure
+real	lower				# Relative lower limit of profiles
+real	ranges[nspectra, LEN_RANGES]	# Ranges array to be set
+int	nspectra			# Number of spectra
+
+int	i
+
+begin
+	do i = 1, nspectra {
+	    ranges[i, X_START] = int (PARAMETER(ms, X0, i)) + lower
+	    ranges[i, DX_START] = ranges[i, X_START] - PARAMETER(ms, X0, i)
+	}
+end