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NAME

       muse_create_sky - Create night sky model from selected pixels of an exposure of empty sky.

SYNOPSIS

       esorex muse_create_sky [OPTIONS] FILE.sof

DESCRIPTION

       This recipe creates the continuum and the atmospheric transition line spectra of the night
       sky from the data in a pixel table(s) belonging to one exposure of (mostly) empty sky.

OPTIONS

       --fraction <float>
              Fraction of the image (without the ignored part) to be considered  as  sky.  If  an
              input sky mask is provided, the fraction is applied to the regions within the mask.
              If the whole sky mask should be used, set this parameter  to  1.  (float;  default:
              0.75).  The  full  name  of  this  option  for  the  EsoRex  configuration  file is
              muse.muse_create_sky.fraction [default = 0.75].

       --ignore <float>
              Fraction of the image to be ignored. If an input sky mask is provided, the fraction
              is  applied  to  the regions within the mask. If the whole sky mask should be used,
              set this parameter to 0. (float; default: 0.05). The full name of this  option  for
              the EsoRex configuration file is muse.muse_create_sky.ignore [default = 0.05].

       --sampling <float>
              Spectral  sampling  of  the  sky spectrum [Angstrom]. (float; default: 0.3125). The
              full   name   of   this   option   for   the   EsoRex   configuration    file    is
              muse.muse_create_sky.sampling [default = 0.3125].

       --csampling <float>
              Spectral  sampling  of the continuum spectrum [Angstrom]. (float; default: 0.3125).
              The  full  name  of  this   option   for   the   EsoRex   configuration   file   is
              muse.muse_create_sky.csampling [default = 0.3125].

       --crsigma <str>
              Sigma  level  clipping for cube-based and spectrum-based CR rejection.  This has to
              be a string of two comma-separated floating-point numbers.  The first  value  gives
              the  sigma-level  rejection  for  cube-based  CR  rejection  (using  "median",  see
              muse_scipost), the second value the sigma-level  for  spectrum-based  CR  cleaning.
              Both  can  be  switched  off,  by  passing zero or a negative value. (str; default:
              ´15.,15.´). The full name of this option  for  the  EsoRex  configuration  file  is
              muse.muse_create_sky.crsigma [default = 15.,15.].

       --lambdamin <float>
              Cut  off  the  data below this wavelength after loading the pixel table(s). (float;
              default: 4000.0). The full name of this option for the EsoRex configuration file is
              muse.muse_create_sky.lambdamin [default = 4000.0].

       --lambdamax <float>
              Cut  off  the  data above this wavelength after loading the pixel table(s). (float;
              default: 10000.0). The full name of this option for the EsoRex  configuration  file
              is muse.muse_create_sky.lambdamax [default = 10000.0].

       --lambdaref <float>
              Reference  wavelength  used  for correction of differential atmospheric refraction.
              The R-band (peak wavelength ~7000 Angstrom) that is usually used  for  guiding,  is
              close  to  the  central wavelength of MUSE, so a value of 7000.0 Angstrom should be
              used if nothing else is known.  A value less than zero switches DAR correction off.
              (float; default: 7000.0). The full name of this option for the EsoRex configuration
              file is muse.muse_create_sky.lambdaref [default = 7000.0].

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

              ftp://ftp.eso.org/pub/dfs/pipelines/muse/muse-pipeline-cookbook-2.6.2.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 muse pipeline are muse_ampl(7), muse_astrometry(7), muse_bias(7),
       muse_dark(7),  muse_exp_align(7),  muse_exp_combine(7),  muse_flat(7),   muse_geometry(7),
       muse_illum(7),    muse_lingain(7),    muse_lsf(7),    muse_qi_mask(7),   muse_scibasic(7),
       muse_scipost(7),     muse_scipost_apply_astrometry(7),     muse_scipost_calibrate_flux(7),
       muse_scipost_combine_pixtables(7),                            muse_scipost_correct_dar(7),
       muse_scipost_correct_rv(7),       muse_scipost_make_cube(7),        muse_scipost_raman(7),
       muse_scipost_subtract_sky(7),    muse_scipost_subtract_sky_simple(7),    muse_standard(7),
       muse_twilight(7), muse_wavecal(7)

VERSION

       muse_create_sky 2.6.2

AUTHOR

       Ole Streicher <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  part  of  the  MUSE  Instrument Pipeline Copyright (C) 2005, 2018 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  02111-1307  USA