xenial (7) fors_spec_mflat.7.gz

NAME

       fors_spec_mflat - Computes master spectroscopic flat, removing bias first

SYNOPSIS

       esorex fors_spec_mflat [OPTIONS] FILE.sof

DESCRIPTION

       This recipe is used to subtract the master bias, produced by the recipe fors_bias, from a set of raw flat
       field frames. The input raw frames are summed,  the  master  bias  frame  is  rescaled  accordingly,  and
       subtracted  from  the  result. The overscan regions, if present, are used to compensate for variations of
       the bias level between master bias and input raw frames.

       The overscan regions are then trimmed from the result.

       In the table below the MXU acronym can be alternatively read as MOS and LSS.

       Input files:

         DO category:               Type:       Explanation:         Required:
         SCREEN_FLAT_MXU            Raw         Raw data frame          Y
         SLIT_LOCATION_MXU          Calib       Slits positions on CCD  Y
         CURV_COEFF_MXU             Calib       Slits tracing fits      Y
         DISP_COEFF_MXU             Calib       Wavelength calibration  Y
         MASTER_BIAS                Calib       Master bias frame       Y

       Output files:

         DO category:               Data type:  Explanation:
         MASTER_SCREEN_FLAT_MXU     FITS image  Bias subtracted sum frame

OPTIONS

       --smooth_sed <float>
              Smoothing size for each flat sed (float; default: 0.0). The full  name  of  this  option  for  the
              EsoRex configuration file is fors.fors_spec_mflat.smooth_sed [default = 0.0].

       --stack_method <str>
              Frames  combination  method  (str;  default:  ´sum´).  The full name of this option for the EsoRex
              configuration file is fors.fors_spec_mflat.stack_method [default = sum].

       --klow <float>
              Low threshold in ksigma method (float; default: 3.0). The full name of this option for the  EsoRex
              configuration file is fors.fors_spec_mflat.klow [default = 3.0].

       --khigh <float>
              High threshold in ksigma method (float; default: 3.0). The full name of this option for the EsoRex
              configuration file is fors.fors_spec_mflat.khigh [default = 3.0].

       --kiter <long>
              Max number of iterations in ksigma method (long; default: 999). The full name of this  option  for
              the EsoRex configuration file is fors.fors_spec_mflat.kiter [default = 999].

       --nonlinear_level <float>
              Level  above  which  the  detector  is not linear (float; default: 50000.0). The full name of this
              option for the  EsoRex  configuration  file  is  fors.fors_spec_mflat.nonlinear_level  [default  =
              50000.0].

       --max_nonlinear_ratio <float>
              Maximum  allowed  ratio of non-linear pixels per slit (float; default: 0.2). The full name of this
              option for the EsoRex configuration file is  fors.fors_spec_mflat.max_nonlinear_ratio  [default  =
              0.2].

       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-4.9.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_align_sky(7),  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_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), montecarlo(7), test_hough(7)

VERSION

       fors_spec_mflat 5.1.4

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) 2002-2011 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