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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
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