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diff --git a/sys/imio/imsetr.x b/sys/imio/imsetr.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<imhdr.h>
+include	<imset.h>
+include	<imio.h>
+
+# IMSETR -- Set an IMIO parameter to a real value.  For completeness this
+# routine can be used to set integer valued parameters, although if the
+# value has a fractional part or requires more than 24 bits of precision
+# the results may be unpredictable.
+
+procedure imsetr (im, param, value)
+
+pointer	im			#I image descriptor
+int	param			#I parameter to be set
+real	value			#I value of parameter
+
+begin
+	switch (param) {
+	case IM_BNDRYPIXVAL:
+	    IM_OOBPIX(im) = value
+	default:
+	    call imseti (im, param, nint(value))
+	}
+end