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       fors_flatfield - Flat field correction of input frame


       esorex fors_flatfield [OPTIONS] FILE.sof


       This  recipe is used to divide the input frame by the normalised flat field frame produced
       by recipe fors_normalise_flat. The input frame must be already bias subtracted  (e.g.,  by
       recipe fors_remove_bias).

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

       Input files:

         DO category:               Type:       Explanation:         Required:
         or STANDARD_UNBIAS_MXU     Raw         Bias subtracted frame   Y
         MASTER_NORM_FLAT_MXU       Calib       Normalised flat frame   Y

       Output files:

         DO category:               Data type:  Explanation:
         or STANDARD_UNFLAT_MXU     FITS image  Flat field corrected frame


       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'


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


       An  overview  over  the  existing  ESO  pipelines  can  be   found   on   the   web   page

       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 for further information.

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


       fors_flatfield 5.1.4


       Carlo Izzo <>


       Please report any problems to Alternatively, you may send  a  report  to
       the ESO User Support Department <>.


       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