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       fors_align_sky_lss - Upgrade wavelength solution using sky lines


       esorex fors_align_sky_lss [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  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

       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

       Input files:

         DO category:               Type:       Explanation:         Required:
         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


       --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 <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_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'


       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(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_lss 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