NAME

       fors_flatfield - Flat field correction of input frame

SYNOPSIS

       esorex fors_flatfield [OPTIONS] FILE.sof

DESCRIPTION

       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:
         SCIENCE_UNBIAS_MXU
         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:
         SCIENCE_UNFLAT_MXU
         or STANDARD_UNFLAT_MXU     FITS image  Flat field corrected 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_remove_bias(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_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_flatfield 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