input,f,a,"",,,>Input images
masks,f,h,"",,,>Input masks
lower,r,h,-99.,,,>Lower limit of usable data
upper,r,h,4096.,,,>Upper limit of usable data
dq,pset,h,,,,>Data Quality bits
subsky,b,h,no,,,>Subtract sky from input images ?
bunit,s,h," ","|      |counts|cps|",,>is the image in count or count per second?
expname,s,h,"",,,>Exposure time keyword name (for countrate image)
skyname,s,h,"",,,>Header parameter to be updated with sky
skyvalue,r,h,,,,>Last image's sky value (output value)
verbose,b,h,yes,,,>Print out verbose messages?
version,s,h,"19May99",,,>Date of installation
mode,s,h,"al"