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diff --git a/math/iminterp/asigetr.x b/math/iminterp/asigetr.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include "im1interpdef.h"
+include <math/iminterp.h>
+
+# ASIGETR -- Procedure to fetch an msi real parameter
+
+real procedure asigetr (asi, param)
+
+pointer	asi		# interpolant descriptor
+int	param		# parameter to be fetched
+
+begin
+	switch (param) {
+	case II_ASIBADVAL:
+	    return (ASI_BADVAL(asi))
+	default:
+	    call error (0, "ASIGETR: Unknown ASI parameter.")
+	}
+end