NAME

       fors_align_sky - Upgrade wavelength solution using sky lines

SYNOPSIS

       esorex fors_align_sky [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 rectified frames are produced by the recipe fors_extract_slits.

       An input catalog of sky lines can be specified, otherwise an internal one is used.

       This recipe should be applied to multi-slit MOS/MXU data: for LSS or long-slit like  data  (MOS/MXU  with
       all  slits  at  the same offset) use recipe fors_align_sky_lss 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 SCI as STD.

       Input files:

         DO category:               Type:       Explanation:         Required:
         RECTIFIED_ALL_SCI_MXU
         or RECTIFIED_SKY_SCI_MXU   Calib       Frame with sky lines    Y
         SPATIAL_MAP_MXU            Calib       Spatial coordinate map  Y
         CURV_COEFF_MXU             Calib       Spectral curvature      Y
         SLIT_LOCATION_MXU          Calib       Slit location on CCD    Y
         DISP_COEFF_MXU             Calib       Dispersion solution     Y
         MASTER_SKYLINECAT          Calib       Catalog of sky lines    .

         GRISM_TABLE                Calib       Grism table             .

       Output files:

         DO category:               Data type:  Explanation:
         SKY_SHIFTS_SLIT_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.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.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.endwavelength [default = 0.0].

       --skyalign <int>
              Polynomial  order  for sky lines alignment (int; default: 0). The full name of this option for the
              EsoRex configuration file is fors.fors_align_sky.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.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-4.9.pdf

       An   overview   over   the   existing   ESO   pipelines    can    be    found    on    the    web    page
       https://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
       https://packages.python.org/python-cpl/index.html for further information.

       The  other  recipes  of  the  fors  pipeline  are  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_subtract_sky_lss(7),  fors_sumflux(7),
       fors_trace_flat(7), fors_wave_calib(7), fors_wave_calib_lss(7), fors_zeropoint(7)

VERSION

       fors_align_sky 5.5.7

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