NAME

       vimos_ima_twilight_flat - Twilight flat combination for imaging

SYNOPSIS

       esorex vimos_ima_twilight_flat [OPTIONS] FILE.sof

DESCRIPTION

       vimos_ima_twilight_flat -- VIMOS twilight flat combine recipe.

       Combine  a  list  of twilight flat frames into a mean frame. Optionally compare the output
       frame to a reference twilight flat frame

       The program accepts the following files in the SOF:

           Tag                   Description

           FLAT_TWILIGHT         A list of raw twilight flat images
           MASTER_BIAS           A master bias frame
           MASTER_DARK           A master dark frame
           REFERENCE_TWILIGHT_FLAT  Optional  reference  twilight  flat  frame  If  no  reference
       twilight flat is made available, then no comparison will be done. This means there will be
       no output ratio image and no stats

OPTIONS

       --lthr <float>
              Low rejection threshold for underexpsed images (float; default: 4000.0).  The  full
              name    of    this    option    for    the    EsoRex    configuration    file    is
              vimos.vimos_ima_twilight_flat.lthr [default = 4000.0].

       --hthr <float>
              High rejection threshold for overexposed images (float; default: 60000.0). The full
              name    of    this    option    for    the    EsoRex    configuration    file    is
              vimos.vimos_ima_twilight_flat.hthr [default = 60000.0].

       --combtype <str>
              Combination algorithm (str; default: ´median´). The full name of  this  option  for
              the  EsoRex configuration file is vimos.vimos_ima_twilight_flat.combtype [default =
              median].

       --scaletype <str>
              Scaling algorithm (str; default: ´multiplicative´). The full name  of  this  option
              for   the  EsoRex  configuration  file  is  vimos.vimos_ima_twilight_flat.scaletype
              [default = multiplicative].

       --xrej <bool>
              True if using extra rejection cycle (bool; default: True). The full  name  of  this
              option  for  the  EsoRex  configuration  file is vimos.vimos_ima_twilight_flat.xrej
              [default = True].

       --thresh <float>
              Rejection threshold in sigma above background (float; default: 5.0). The full  name
              of     this     option     for     the     EsoRex     configuration     file     is
              vimos.vimos_ima_twilight_flat.thresh [default = 5.0].

       --ncells <int>
              Number of cells for diff image stats (int; default:  8).  The  full  name  of  this
              option  for  the  EsoRex configuration file is vimos.vimos_ima_twilight_flat.ncells
              [default = 8].

       --prettynames <bool>
              Use pretty output file names? (bool; default: False). The full name of this  option
              for  the  EsoRex  configuration  file  is vimos.vimos_ima_twilight_flat.prettynames
              [default = False].

       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 vimos pipeline can be downloaded as a PDF  file  using  the
       following URL:

              ftp://ftp.eso.org/pub/dfs/pipelines/vimos/vimos-pipeline-manual-6.9.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  vimos  pipeline  are  vimos_ima_bias(7),  vimos_ima_dark(7),
       vimos_ima_det_noise(7), vimos_ima_fringe(7), vimos_ima_science(7),  vimos_ima_standard(7),
       vmbias(7),   vmdark(7),  vmdet(7),  vmifucalib(7),  vmifucombine(7),  vmifucombinecube(7),
       vmifuscience(7), vmifustandard(7), vmmoscalib(7), vmmosscience(7), vmspphot(7)

VERSION

       vimos_ima_twilight_flat 4.1.6

AUTHOR

       Jim Lewis <jrl@ast.cam.ac.uk>

BUG REPORTS

       Please report any problems to jrl@ast.cam.ac.uk. Alternatively, you may send a  report  to
       the ESO User Support Department <usd-help@eso.org>.

LICENSE

       This  file  is  part of the VIMOS Instrument Pipeline Copyright (C) 2019 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., 59 Temple Place, Suite 330, Boston,
       MA  02111-1307  USA