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.

VERSION

fors_spec_mflat 5.3.5

AUTHOR

Carlo Izzo <[email protected]>

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