Provided by: cpl-plugin-fors-doc_5.3.32+dfsg-1_all bug


       fors_align_sky - Upgrade wavelength solution using sky lines


       esorex fors_align_sky [OPTIONS] FILE.sof


       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:
         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


       --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 =

       --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'


       The full documentation for the fors pipeline can be downloaded as a  PDF  file  using  the
       following URL:


       An   overview   over   the   existing   ESO  pipelines  can  be  found  on  the  web  page

       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 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)


       fors_align_sky 5.3.32


       Carlo Izzo <>


       Please report any problems to Alternatively, you may send  a  report  to
       the ESO User Support Department <>.


       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