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 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
e	Print error messages
r	Rewind the coordinate list
q	Exit task 



                 Colon Commands

:show	[data/fit]	List the parameters
:m [n]	Move to next [nth] star in coordinate list
:n [n]	Fit 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]		Scale factor (scale units)		
:emission	[y/n]		Emission feature (y), absorption (n)
:sigma		[value]		Standard deviation of sky (counts)
:datamin	[value]		Minimum good data value (counts)
:datamax	[value]		Maximum good data value (counts)

# Noise description 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]		Readnoise (electrons)

# Observation 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)

# Fitting parameters

:function	[string]	PSF model (radgauss|elgauss|moments)
:box		[value]		Width of the fitting box (scale units)
:maxiter	[value]		Maximum number of iterations
:nreject	[value]		Maximum number of rejection cycles
:kreject	[value]		Rejection limit (sigma)

# Plotting and marking functions

:mkbox		[y/n]		Mark the fitting box on the display