NAME

       fors_subtract_sky_lss - Subtract sky from calibrated long slit exposure

SYNOPSIS

       esorex fors_subtract_sky_lss [OPTIONS] FILE.sof

DESCRIPTION

       This  recipe  is  used  to  subtract the sky from wavelength calibrated scientific spectra
       produced by the recipe fors_resample. A simple median signal level is subtracted from each
       image column.

       In  the table below the MXU acronym can be read alternatively as MOS and LSS, depending on
       the instrument mode of the input data. The acronym SCI may be read STD in case of standard
       stars observations.

       Note that only LSS or LSS-like MOS/MXU data are to be processed by this recipe.

       Input files:

         DO category:               Type:       Explanation:         Required:
         MAPPED_ALL_SCI_MXU         Raw         Scientific exposure     Y

       Output files:

         DO category:               Data type:  Explanation:
         MAPPED_SCI_MXU             FITS image  Rectified scientific spectra
         MAPPED_SKY_SCI_MXU         FITS image  Rectified sky spectra

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-4.9.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_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_flatfield(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_sumflux(7),     fors_trace_flat(7),
       fors_wave_calib(7), fors_wave_calib_lss(7), fors_zeropoint(7)

VERSION

       fors_subtract_sky_lss 5.3.23

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