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+	Interactive Keystroke Commands
+
+?	Print help
+:	Colon commands
+v	Verify the critical parameters
+w	Save the current parameters
+d	Plot radial profile of current star 
+i	Interactively set parameters using current star
+f	Fit sky for current star
+spbar	Fit sky for current star, output results
+m	Move to next star in coordinate list
+m	Fit sky for next star in coordinate list, output results
+l	Fit sky for remaining stars in coordinate list, output results
+e	Print error messages
+r	Rewind the coordinate list
+q	Exit task
+
+
+        Colon commands
+
+:show	[data/sky]	List the parameters
+:m [n]	Move to the next [nth] star in coordinate list
+:n [n]	Fit sky to next [nth] star in coordinate list, output results
+
+	Colon Parameter Editing Commands
+
+# Image and file name parameters
+
+:image		[string]	Image name
+:coords		[string]	Coordinate file name
+:output 	[string]	Output file name
+
+# Data dependent parameters
+
+:scale		[value]		Image scale (units per pixel)
+:fwhmpsf	[value]		Full width half maximum PSF (scale units)
+:emission	[y/n]		Emission feature (y), absorption (n)
+:sigma		[value]		Standard deviation of sky (counts)
+:datamin	[value]		Minimum good pixel value (counts)
+:datamax	[value]		Maximum good pixel value (counts)
+
+# Noise parameters
+
+:noise		[string]	Noise model (constant|poisson)
+:gain		[string]	Gain image header keyword
+:ccdread	[string]	Readout noise image header keyword
+:epadu		[value]		Gain (electrons per adu)
+:readnoise	[value]		Readout noise (electrons)
+
+# Observations parameters
+
+:exposure	[string]	Exposure time image header keyword
+:airmass	[string]	Airmass image header keyword
+:filter		[string]	Filter image header keyword
+:obstime	[string]	Time of observation image header keyword
+:itime		[value]		Exposure time (time units)
+:xairmass	[value]		Airmass value (number)
+:ifilter	[string]	Filter id string
+:otime		[string]	Time of observation (time units)
+
+# Sky fitting algorithm parameters
+
+:salgorithm	[string]	Sky fitting algorithm 
+:skyvalue	[value]		User supplied sky value (counts)
+:annulus 	[value]		Inner radius of sky annulus (scale units)
+:dannulus	[value]		Width of sky annulus (scale units)
+:khist		[value]		Sky histogram extent (+/- sky sigma)
+:smooth		[y/n]		Lucy smooth the sky histogram 
+:binsize	[value]		Resolution of sky histogram (sky sigma)
+:smaxiter	[value]		Maximum number of iterations
+:sloclip	[value]		Low side clipping factor (percent)
+:shiclip	[value]		High side clipping factor (percent)
+:snreject	[value]		Maximum number of rejection cycles
+:sloreject	[value]		Low side pixel rejection limits (sky sigma)
+:shireject	[value]		High side pixel rejection limits (sky sigma)
+:rgrow		[value]		Region growing radius (scale units)
+
+# Marking and plotting parameters
+
+:mksky		[y/n]		Mark sky annuli on the display
+:radplot	[y/n]		Plot radial profile of sky pixels