# Parameters to control routines dealing with finding, fitting and
#   subtracting the background sky level
#
#

# cleaned images here; we may overwrite them
output_dir    ../output
 
# parameters controlling the "sky" program, which finds a mean sky level
#  "min_accept" and "max_accept" are the limits on 
#   pixel values we consider in the sky-finding procedure
skybin           3
min_accept  -25000
max_accept   25000

# set "subtract_sky" to 1 in order to subtract a model of the sky
#                       0 to leave the sky in the cleaned image
subtract_sky 1


# Maximum acceptable values for the sky and skysig, in each filter
#    The values are counts, after dark has been subtracted.  So a value
#    of 0 would mean "absolutely no light from the sky," and a value
#    of 1000 would mean "1000 counts above the dark level".
#    Each filter has its own value.
#    Used by the "check_sky" routine
max_sky { V 3500 } { I  5000 }
max_skysig { V 200 } { I 200 }


#
# parameters controlling the "back" program, which fits a simple model
# to the background sky and subtracts that model from the image
# All the following only relevant if "subtract_sky" set to 1
#
# We copy the "min_accept", "max_accept" and "skybin" values above and 
#    use them in the "back" program as well ...

#  into how many pieces in each dir do we break up image?
ngrid       10
#  order of polynomial model: 0 = const, 1 = linear, 2 = quadratic
order        1
#  if desired, we write a map showing the background model to this file
#  (it will be overwritten each time, so useful only for debugging or
#  running on particular images, one at a time)
#  Leave blank to indicate no map is desired.
map        back_map.fts
#  set this to 1 to get info on the fitted model parameters printed
#    in the pipeline output
verbose      1