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diff --git a/noao/digiphot/apphot/center/apcerrors.x b/noao/digiphot/apphot/center/apcerrors.x
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+++ b/noao/digiphot/apphot/center/apcerrors.x
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+include "../lib/center.h"
+
+# AP_CERRORS -- Procedure to print the centering task error messages.
+
+procedure ap_cerrrors (ap, ier)
+
+pointer	ap		# apphot pointer (unused)
+int	ier		# centering error code
+
+begin
+	switch (ier) {
+	case AP_CTR_NOAREA:
+	    call printf ("There are no pixels in the centering box.\n")
+        case AP_CTR_OUTOFBOUNDS:
+	    call printf (
+	        "The centering region is partially outside the image.\n")
+	case AP_CTR_NTOO_SMALL:
+	    call printf ("The centering box has too few points.\n")
+	case AP_CTR_SINGULAR:
+	    call printf ("The centering solution is singular.\n")
+	case AP_CTR_NOCONVERGE:
+	    call printf ("The centering algorithm does not converge.\n")
+	case AP_CTR_BADSHIFT:
+	    call printf ("The center shift is large.\n")
+	case AP_CTR_LOWSNRATIO:
+	    call printf ("The signal to noise ratio is low.\n")
+	case AP_CTR_BADDATA:
+	    call printf ("Bad data in the centering subraster.\n")
+	default:
+	    call printf ("")
+	}
+end