	     Interactive Keystroke Commands

?	Print help
:	Colon commands 
v	Verify the critical parameters
w	Save the current parameters
d	Plot radial profile of star near cursor
i	Interactively set parameters using star near cursor
f	Find stars in the image
spbar	Find stars in the image, output results
q	Exit task


		Colon Commands

:show		[data/center]	List the parameters

		Colon Parameter Editing Commands

# Image and file name parameters

:image		[string]	Image name
:output		[string]	Output file name

# Data dependent parameters

:scale		[value]		Image scale (units per pixel)
:fwhmpsf	[value]		Full width half maximum of psf (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]		Readout noise (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)

# Object detection parameters

:nsigma		[value]		Size of Gaussian kernel (sigma) 
:threshold	[value]		Detection intensity threshold (counts)
:ratio		[value]		Sigmay / sigmax of Gaussian kernel
:theta		[value]		Position angle of Gaussian kernel
:sharplo	[value]		Lower bound on sharpness
:sharphi	[value]		Upper bound on sharpness
:roundlo	[value]		Lower bound on roundness
:roundhi	[value]		Upper bound on roundness

# Plotting and marking commands

:mkdetections	[y/n]		Mark detections on the image display
