NAME

       fors_remove_bias - Subtract bias from input frame

SYNOPSIS

       esorex fors_remove_bias [OPTIONS] FILE.sof

DESCRIPTION

       This  recipe  is  used to subtract the master bias, produced by the recipe fors_bias, from
       one raw data frame.  The  overscan  regions,  if  present,  are  used  to  compensate  for
       variations of the bias level between master bias and input raw frame. The overscan regions
       are then trimmed from the result.

       In the table below the MXU acronym can be alternatively read as MOS and LSS.

       Input files:

         DO category:               Type:       Explanation:         Required:
         LAMP_MXU
         or SCIENCE_MXU
         or STANDARD_MXU            Raw         Raw data frame          Y
         MASTER_BIAS                Calib       Master bias frame       Y

       Output files:

         DO category:               Data type:  Explanation:
         LAMP_UNBIAS_MXU
         or SCIENCE_UNBIAS_MXU
         or STANDARD_UNBIAS_MXU     FITS image  Bias subtracted frame

OPTIONS

       Note that it is possible to create a configuration file containing  these  options,  along
       with  suitable default values. Please refer to the details provided by the 'esorex --help'
       command.

SEE ALSO

       The full documentation for the fors pipeline can be downloaded as a  PDF  file  using  the
       following URL:

              ftp://ftp.eso.org/pub/dfs/pipelines/fors/fors-pipeline-manual-4.7.pdf

       An   overview   over   the   existing   ESO  pipelines  can  be  found  on  the  web  page
       http://www.eso.org/sci/software/pipelines/.

       Basic documentation about the EsoRex program can be found at the esorex (1) man page.

       It is possible to call the pipelines  from  python  using  the  python-cpl  package.   See
       http://packages.python.org/python-cpl/index.html for further information.

       The  other  recipes of the fors pipeline are fors_wave_calib_lss(7), fors_img_sky_flat(7),
       fors_resample(7),      fors_config(7),       fors_extract_objects(7),       fors_calib(7),
       fors_wave_calib(7),   fors_detect_objects(7),   fors_pmos_science(7),   fors_zeropoint(7),
       fors_extract_slits(7),  fors_extract(7),   fors_subtract_sky(7),   fors_normalise_flat(7),
       fors_photometry(7),   fors_img_screen_flat(7),   fors_dark(7),   fors_subtract_sky_lss(7),
       fors_trace_flat(7),   fors_flatfield(7),   fors_img_science(7),    fors_detect_spectra(7),
       fors_sumflux(7),      fors_pmos_extract(7),      fors_align_sky_lss(7),      fors_bias(7),
       fors_align_sky(7), fors_pmos_calib(7), fors_spec_mflat(7), fors_science(7)

VERSION

       fors_remove_bias 4.11.12

AUTHOR

       Carlo Izzo <usd-help@eso.org>

BUG REPORTS

       Please report any problems to usd-help@eso.org. Alternatively, you may send  a  report  to
       the ESO User Support Department <usd-help@eso.org>.

LICENSE

       This  file  is  currently  part  of  the  FORS Instrument Pipeline Copyright (C) 2002-2010
       European Southern Observatory

       This program is free software; you can redistribute it and/or modify it under the terms of
       the  GNU  General  Public  License  as  published  by the Free Software Foundation; either
       version 2 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY  WARRANTY;
       without  even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
       See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program;
       if  not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
       MA  02110-1301  USA