NAME

       fors_align_sky_lss - Upgrade wavelength solution using sky lines

SYNOPSIS

       esorex fors_align_sky_lss [OPTIONS] FILE.sof

DESCRIPTION

       This  recipe  is used to align the wavelength solution based on the arc lamp exposure on a
       set of sky lines observed on a scientific exposure.

       The  input  scientific  frames  are  produced  by   the   recipes   fors_remove_bias   and
       fors_flatfield.  An  input  catalog  of  sky lines can be specified, or an internal one is
       used.

       This recipe should be applied to LSS or long-slit like data (MOS/MXU with all slits at the
       same  offset). For multi-slit MOS/MXU data use recipe fors_align_sky instead. Please refer
       to the FORS PIpeline User´s Manual for more details.

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

       Input files:

         DO category:               Type:       Explanation:         Required:
         SCIENCE_UNBIAS_MXU
         or SCIENCE_UNFLAT_MXU
         or STANDARD_UNBIAS_MXU
         or STANDARD_UNFLAT_MXU     Calib       Frame with sky lines    Y
         DISP_COEFF_MXU             Calib       Dispersion solution     Y
         SLIT_LOCATION_MXU          Calib       Slit location on CCD    Y
         MASTER_SKYLINECAT          Calib       Catalog of sky lines    .

         GRISM_TABLE                Calib       Grism table             .

       Output files:

         DO category:               Data type:  Explanation:
         SKY_SHIFTS_LONG_SCI_MXU    FITS table  Observed sky lines offsets
         WAVELENGTH_MAP_SCI_MXU     FITS image  Wavelength mapped on CCD
         DISP_COEFF_SCI_MXU         FITS image  Upgraded dispersion solution

OPTIONS

       --dispersion <float>
              Expected  spectral dispersion (Angstrom/pixel) (float; default: 0.0). The full name
              of     this     option     for     the     EsoRex     configuration     file     is
              fors.fors_align_sky_lss.dispersion [default = 0.0].

       --startwavelength <float>
              Start  wavelength  in  spectral  extraction (float; default: 0.0). The full name of
              this      option      for      the      EsoRex      configuration      file      is
              fors.fors_align_sky_lss.startwavelength [default = 0.0].

       --endwavelength <float>
              End  wavelength in spectral extraction (float; default: 0.0). The full name of this
              option for the EsoRex configuration file  is  fors.fors_align_sky_lss.endwavelength
              [default = 0.0].

       --skyalign <long>
              Polynomial  order for sky lines alignment (long; default: 0). The full name of this
              option  for  the  EsoRex  configuration  file  is  fors.fors_align_sky_lss.skyalign
              [default = 0].

       --wcolumn <str>
              Name  of sky line catalog table column with wavelengths (str; default: ´WLEN´). The
              full   name   of   this   option   for   the   EsoRex   configuration    file    is
              fors.fors_align_sky_lss.wcolumn [default = WLEN].

       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_flatfield(7),  fors_img_science(7),
       fors_detect_spectra(7),     fors_sumflux(7),      fors_pmos_extract(7),      fors_bias(7),
       fors_align_sky(7), fors_pmos_calib(7), fors_spec_mflat(7), fors_science(7)

VERSION

       fors_align_sky_lss 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