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 <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.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-4.7.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_align_sky_lss(7),
       fors_bias(7), fors_pmos_calib(7), fors_spec_mflat(7), fors_science(7)

VERSION

       fors_align_sky 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