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 4.1.7

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