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diff --git a/noao/digiphot/apphot/lib/fitsky.h b/noao/digiphot/apphot/lib/fitsky.h
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+# FITSKY definitions
+
+# define the sky fitting algorithms
+
+define	AP_CONSTANT	1	# Use a constant sky
+define	AP_MODE		2	# Compute the mode of the sky pixels
+define	AP_CENTROID	3	# Compute the peak of the histogram
+define	AP_SKYFILE	4	# Get values from a file
+define	AP_HISTPLOT	5	# Mark the sky on a histogram plot
+define	AP_MEDIAN	6	# Take median of sky pixels
+define	AP_RADPLOT	7	# Mark sky on radial profile plot
+define	AP_GAUSS	8	# Non-linear fit to a Gaussian
+define	AP_OFILT	9	# Optimal filtering
+define	AP_CROSSCOR	10	# Cross correlation method
+define	AP_MEAN		11	# Compute the mean of the sky pixels
+
+# define sky fitting errors (# 201 - 300)
+
+define	AP_OK			0	# No error
+define	AP_NOSKYAREA		201	# Width of the annulus is <= 0.0 pixels
+define	AP_SKY_OUTOFBOUNDS	202	# Sky annulus out of bounds
+define	AP_NOHISTOGRAM		203	# Cannot make a histogram
+define	AP_FLAT_HIST		204	# Histogram is flat or concave
+define	AP_NSKY_TOO_SMALL	205	# Too few points for fit
+define	AP_SKY_SINGULAR		206	# Fit is singular
+define	AP_SKY_NOCONVERGE	207	# Solution does not converge
+define	AP_NOGRAPHICS		208	# NULL graphics pointer
+define	AP_NOSKYFILE		209	# NULL sky file descriptor
+define	AP_EOFSKYFILE		210	# End of sky file
+define	AP_BADSKYSCAN		211	# Incomplete scan of sky file
+define	AP_BADPARAMS		212	# Non-physical parameters
+
+# sky fitting parameters (# 201 - 300)
+
+define	SKYFUNCTION	201
+define	ANNULUS		202
+define	DANNULUS	203
+define	SKY_BACKGROUND	204
+define	K1		205
+define	BINSIZE		206
+define	SMOOTH		207
+define	SMAXITER	208
+define	SLOCLIP		209
+define	SHICLIP		210
+define	SNREJECT	211
+define	SLOREJECT	212
+define	SHIREJECT	213
+define	RGROW		214
+define	SKY_MODE	215
+define	SKY_SIGMA	216
+define	SKY_SKEW	217
+define	NSKY		218
+define	NSKY_REJECT	219
+define	SXCUR		220
+define	SYCUR		221
+define	OSXCUR		222
+define	OSYCUR		223
+define	SSTRING		224
+
+# define sky fitting keywords
+
+define	KY_SSTRING		"salgorithm"
+define	KY_ANNULUS		"annulus"
+define	KY_DANNULUS		"dannulus"
+define	KY_SKY_BACKGROUND	"skyvalue"
+define	KY_K1			"khist"
+define	KY_BINSIZE		"binsize"
+define	KY_SMOOTH		"smooth"
+define	KY_SMAXITER		"smaxiter"
+define	KY_SLOCLIP		"sloclip"
+define	KY_SHICLIP		"shiclip"
+define	KY_SNREJECT		"snreject"
+define	KY_SLOREJECT		"sloreject"
+define	KY_SHIREJECT		"shireject"
+define	KY_RGROW		"rgrow"
+
+# define sky fitting units strings
+
+#define	UN_SSTRING		"algorithm"
+#define	UN_ANNULUS		"scaleunit"
+#define	UN_DANNULUS		"scaleunit"
+#define	UN_SKY_BACKGROUND	"counts"
+#define	UN_K1			"sigma"
+#define	UN_BINSIZE		"sigma"
+#define	UN_SMOOTH		"switch"
+#define	UN_SMAXITER		"number"
+#define	UN_SLOCLIP		"percent"
+#define	UN_SHICLIP		"percent"
+#define	UN_SNREJECT		"number"
+#define	UN_SLOREJECT		"sigma"
+#define	UN_SHIREJECT		"sigma"
+#define	UN_RGROW		"scaleunit"
+
+define	UN_SALGORITHM		"algorithm"
+define	UN_SSCALEUNIT		"scaleunit"
+define	UN_SSIGMA		"sigma"
+define	UN_SNUMBER		"number"
+define	UN_SPERCENT		"percent"
+define	UN_SCOUNTS		"counts"
+define	UN_SSWITCH		"switch"
+
+# fitsky string definitions
+
+define	SSHOWARGS	"|data|sky|"
+define	SFUNCS		"|constant|mode|centroid|file|histplot|median|\
+radplot|gauss|ofilter|crosscor|mean|"
+define	SCMDS		"|annulus|dannulus|salgorithm|khist|sloreject|\
+shireject|smaxiter|binsize|smooth|rgrow|snreject|skyvalue|mksky|sloclip|\
+shiclip|"
+
+define	SCMD_ANNULUS		1
+define	SCMD_DANNULUS		2
+define	SCMD_SALGORITHM 	3
+define	SCMD_KHIST		4
+define	SCMD_SLOREJECT		5
+define	SCMD_SHIREJECT		6
+define	SCMD_SMAXITER		7
+define	SCMD_BINSIZE		8
+define	SCMD_SMOOTH		9
+define	SCMD_RGROW		10
+define	SCMD_SNREJECT		11
+define	SCMD_SKYVALUE 		12
+define	SCMD_MKSKY		13
+define	SCMD_SLOCLIP		14
+define	SCMD_SHICLIP		15
+
+define	SCMD_DATA		1
+define	SCMD_SKY		2