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diff --git a/noao/digiphot/apphot/center/apcerrors.x 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