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diff --git a/noao/twodspec/apextract/apcveval.x b/noao/twodspec/apextract/apcveval.x
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+++ b/noao/twodspec/apextract/apcveval.x
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+include	<math/curfit.h>
+
+# AP_CVEVAL -- Interface to CVEVAL that avoids extrapolation.
+# This is necessary because if the tracing was truncated due to loss
+# of the profile the trace limits will be smaller than the image axis.
+# In the longer term the aperture limits along the dispersion should be
+# used to limit the extent of the spectrum.
+
+real procedure ap_cveval (cv, x)
+
+pointer	cv		#I CURFIT pointer
+real	x		#I Point to be evaluated.
+
+real	x1, cvstatr(), cveval()
+
+begin
+	x1 = min (max (x, cvstatr(cv,CVXMIN)), cvstatr(cv,CVXMAX))
+	return (cveval (cv, x1))
+end