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+	Interactive Keystroke Commands
+
+?	Print help
+:	Colon commands
+v	Verify the critical parameters
+w	Store the current parameters
+d	Plot radial profile of current star
+i	Interactively set parameters using current star
+c	Fit center of current star
+t	Fit sky around cursor
+a       Average sky values fit around several cursor positions
+s	Fit sky around the current star 
+p	Fit star using current sky
+o	Fit star using current sky, output results
+f	Fit current star
+spbar	Fit current star, output results
+m	Move to next star in coordinate list
+n	Fit next star in coordinate list, output results
+l	Fit remaining stars in coordinate list, output results	
+r	Rewind the coordinate list
+e	Print error messages
+q	Exit task
+
+
+	Colon Commands
+
+:show	[data/center/sky/fit]	List the parameters
+:m [n]	Move to next [nth] object in coordinate list
+:n [n]	Fit next [nth] object 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		[vlaue]		Image scale (units per pixel)
+:fwhmpsf	[value]		Full-width half-maximum of psf (scale units)
+:emission	[y/n]		Emission features (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)
+
+# Observing parameters
+
+:exposure	[value]		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]		Integration time (time units)
+:xairmass	[value]		Airmass value (number)
+:ifilter	[string]	Filter id string
+:otime		[string]	Time of observation (time units)
+
+# Centering algorithm parameters
+
+:calgorithm	[string]	Centering algorithm
+:cbox		[value]		Width of the centering box (scale units)
+:cthreshold	[value]		Centering intensity threshold (sigma)
+:cmaxiter	[value]		Maximum number of iterations
+:maxshift	[value]		Maximum center shift (scale units)
+:minsnratio	[value]		Minimum S/N ratio for centering
+:clean		[y/n]		Clean subraster before centering
+:rclean		[value]		Cleaning radius (scale units)
+:rclip		[value]		Clipping radius (scale units)
+:kclean		[value]		Clean K-sigma rejection limit (sigma)
+
+# 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 (+/- sigma)
+:binsize	[value]		Resolution of sky histogram (sigma)
+:sloclip	[value]		Low-side clipping factor in percent
+:shiclip	[value]		High-side clipping factor in percent
+:smaxiter	[value]		Maximum number of iterations
+:smooth		[y/n]		Lucy smooth the sky histogram
+: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)
+
+# Photometry parameters
+
+:apertures	[string]	List of apertures (scale units)
+:zmag		[value]		Zero point of magnitude scale
+
+# Profile fitting parameters
+
+:radius		[value]		Maximum profile radius (scale units)
+:step		[value]		Step size for computed profile (scale units)
+:order		[value]		Number of spline pieces in fit
+:kreject	[value]		K-sigma rejection for fit (fit sigma)
+:nreject	[value]		Maximum number of rejection cycles
+
+# Marking and plotting parameters
+
+:mkcenter	[y/n]		Mark computed centers on display
+:mksky		[y/n]		Mark the sky annuli on the display
+:mkapert	[y/n]		Mark apertures on the display
+:radplot	[y/n]		Plot the radial profile