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diff --git a/noao/digiphot/apphot/fitsky/apsconfirm.x b/noao/digiphot/apphot/fitsky/apsconfirm.x
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+++ b/noao/digiphot/apphot/fitsky/apsconfirm.x
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+include "../lib/apphot.h"
+include "../lib/noise.h"
+include "../lib/fitsky.h"
+
+# AP_SCONFIRM -- Procedure to confirm the critical fitsky parameters.
+
+procedure ap_sconfirm (ap, out, stid)
+
+pointer	ap		# pointer to the apphot structure
+int	out		# output file descriptor
+int	stid		# output file sequence number
+
+pointer	sp, str
+real	annulus, dannulus, skysigma, datamin, datamax
+int	apstati()
+real	apstatr(), ap_vannulus(), ap_vdannulus(), ap_vsigma()
+real	ap_vdatamin(), ap_vdatamax()
+
+begin
+	call smark (sp)
+	call salloc (str, SZ_LINE, TY_CHAR)
+
+	call printf ("\n")
+
+	# Confirm the sky fitting algorithm.
+	call ap_vsstring (ap, Memc[str], SZ_FNAME)
+
+	# Confirm the remaining parameters.
+	if (apstati (ap, SKYFUNCTION) != AP_CONSTANT &&
+	    apstati (ap, SKYFUNCTION) != AP_SKYFILE) {
+
+	    # Confirm the sky annulus parameter.
+	    annulus = ap_vannulus (ap)
+
+	    # Confirm the width of the sky annulus.
+	    dannulus = ap_vdannulus (ap)
+
+	} else {
+
+	    annulus = apstatr (ap, ANNULUS)
+	    dannulus = apstatr (ap, DANNULUS)
+
+	}
+
+	# Confirm the sky sigma parameter.
+	if (apstati (ap, SKYFUNCTION) != AP_SKYFILE)
+	    skysigma = ap_vsigma (ap)
+	else
+	    skysigma = apstatr (ap, SKYSIGMA)
+
+	# Confirm the minimum and maximum good data values.
+	datamin = ap_vdatamin (ap)
+	datamax = ap_vdatamax (ap)
+
+	call printf ("\n")
+
+	# Update the database file.
+	if (out != NULL && stid > 1) {
+	    call ap_sparam (out, KY_SSTRING, Memc[str], UN_SALGORITHM,
+		"sky fitting algorithm")
+	    call ap_rparam (out, KY_ANNULUS, annulus, UN_SSCALEUNIT,
+	        "inner radius of sky annulus")
+	    call ap_rparam (out, KY_DANNULUS, dannulus, UN_SSCALEUNIT,
+	        "width of the sky annulus")
+	    call ap_rparam (out, KY_SKYSIGMA, skysigma, UN_NCOUNTS,
+	        "standard deviation of 1 sky pixel") 
+	    call ap_rparam (out, KY_DATAMIN, datamin, UN_ACOUNTS,
+	        "minimum good data value") 
+	    call ap_rparam (out, KY_DATAMAX, datamax, UN_ACOUNTS,
+	        "maximum good data value") 
+	}
+
+	call sfree (sp)
+end