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diff --git a/math/iminterp/msigetr.x b/math/iminterp/msigetr.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include "im2interpdef.h"
+include <math/iminterp.h>
+
+# MSIGETR -- Procedure to fetch an msi real parameter
+
+real procedure msigetr (msi, param)
+
+pointer	msi		# interpolant descriptor
+int	param		# parameter to be fetched
+
+begin
+	switch (param) {
+	case II_MSIBADVAL:
+	    return (MSI_BADVAL(msi))
+	default:
+	    call error (0, "MSIGETR: Unknown MSI parameter.")
+	}
+end