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diff --git a/noao/digiphot/apphot/polyphot/appyerrors.x b/noao/digiphot/apphot/polyphot/appyerrors.x
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+include "../lib/polyphot.h"
+
+# AP_PYERRORS -- Procedure to print out polyphot error messages when the
+# task is run in interactive mode.
+
+procedure ap_pyerrors (ap, cier, sier, pier)
+
+pointer	ap		# apphot structure
+int	cier		# centering error code
+int	sier		# sky fitting error code
+int	pier		# polyphot error code
+
+begin
+	# Print centering errors.
+	call ap_cerrors (ap, cier)
+
+	# Print sky fitting errors.
+	call ap_serrors (ap, sier)
+
+	# Print the polyphot errors.
+	switch (pier) {
+	case PY_NOPOLYGON:
+	    call printf ("The polygon is undefined or too few vertices.\n")
+	case PY_OUTOFBOUNDS:
+	    call printf ("The polygon is partially outside the image.\n")
+	case PY_NOPIX:
+	    call printf ("The effective polygon area is 0.0.\n")
+	case PY_NOSKYMODE:
+	    call printf ("The sky value is undefined.\n")
+	case PY_BADDATA:
+	    call printf ("Bad pixels inside the polygon.\n")
+	default:
+	    call printf ("")
+	}
+end