Provided by: cpl-plugin-fors-doc_4.11.12+dfsg-3_all 
NAME
fors_calib - Determination of the extraction mask
SYNOPSIS
esorex fors_calib [OPTIONS] FILE.sof
DESCRIPTION
This recipe is used to identify reference lines on LSS, MOS and MXU arc lamp exposures,
and trace the spectral edges on the corresponding flat field exposures. This information
is used to determine the spectral extraction mask to be applied in the scientific data
reduction, performed with the recipe fors_science.
This recipe accepts both FORS1 and FORS2 frames. The input arc lamp and flat field
exposures are assumed to be obtained quasi-simultaneously, so that they would be described
by exactly the same instrument distortions.
A line catalog must be specified, containing the wavelengths of the reference arc lamp
lines used for the wavelength calibration. A grism table (typically depending on the
instrument mode, and in particular on the grism used) may also be specified: this table
contains a default recipe parameter setting to control the way spectra are extracted for a
specific instrument mode, as it is used for automatic run of the pipeline on Paranal and
in Garching. If this table is specified, it will modify the default recipe parameter
setting, with the exception of those parameters which have been explicitly modified on the
command line.
If a grism table is not specified, the input recipe parameters values will always be read
from the command line, or from an esorex configuration file if present, or from their
generic default values (that are rarely meaningful). Finally a master bias frame must be
input to this recipe.
In the table below the MXU acronym can be read alternatively as MOS and LSS, with the
exception of CURV_COEFF_LSS, CURV_TRACES_LSS, SPATIAL_MAP_LSS, SPECTRA_DETECTION_LSS, and
and SLIT_MAP_LSS, which are never created. The products SPECTRA_DETECTION_MXU,
SLIT_MAP_MXU, and DISP_RESIDUALS_MXU, are just created if the --check parameter is set to
true. The product GLOBAL_DISTORTION_TABLE is just created if more than 12 separate spectra
are found in the CCD.
Input files:
DO category: Type: Explanation: Required:
SCREEN_FLAT_MXU Raw Flat field exposures Y
LAMP_MXU Raw Arc lamp exposure Y
MASTER_BIAS Calib Master Bias frame Y
MASTER_LINECAT Calib Line catalog Y
GRISM_TABLE Calib Grism table .
Output files:
DO category: Data type: Explanation:
MASTER_SCREEN_FLAT_MXU FITS image Combined (sum) flat field
MASTER_NORM_FLAT_MXU FITS image Normalised flat field
MAPPED_SCREEN_FLAT_MXU FITS image Wavelength calibrated flat field
MAPPED_NORM_FLAT_MXU FITS image Wavelength calibrated normalised flat
REDUCED_LAMP_MXU FITS image Wavelength calibrated arc spectrum
DISP_COEFF_MXU FITS table Inverse dispersion coefficients
DISP_RESIDUALS_MXU FITS image Residuals in wavelength calibration
DISP_RESIDUALS_TABLE_MXU FITS table Residuals in wavelength calibration
DELTA_IMAGE_MXU FITS image Offset vs linear wavelength calib
WAVELENGTH_MAP_MXU FITS image Wavelength for each pixel on CCD
SPECTRA_DETECTION_MXU FITS image Check for preliminary detection
SLIT_MAP_MXU FITS image Map of central wavelength on CCD
CURV_TRACES_MXU FITS table Spectral curvature traces
CURV_COEFF_MXU FITS table Spectral curvature coefficients
SPATIAL_MAP_MXU FITS image Spatial position along slit on CCD
SPECTRAL_RESOLUTION_MXU FITS table Resolution at reference arc lines
DETECTED_LINES_MXU FITS table All the lines detected in the arc
ARC_RECTIFIED_MXU FITS iamge The spatial rectified arc
SLIT_LOCATION_MXU FITS table Slits on product frames and CCD
GLOBAL_DISTORTION_TABLE FITS table Global distortions table
OPTIONS
--dispersion <float>
Expected spectral dispersion (Angstrom/pixel) (float; default: 0.0). The full name
of this option for the EsoRex configuration file is fors.fors_calib.dispersion
[default = 0.0].
--peakdetection <float>
Initial peak detection threshold (ADU) (float; default: 0.0). The full name of this
option for the EsoRex configuration file is fors.fors_calib.peakdetection [default
= 0.0].
--wdegree <long>
Degree of wavelength calibration polynomial (long; default: 0). The full name of
this option for the EsoRex configuration file is fors.fors_calib.wdegree [default =
0].
--wradius <long>
Search radius if iterating pattern-matching with first-guess method (long; default:
4). The full name of this option for the EsoRex configuration file is
fors.fors_calib.wradius [default = 4].
--wreject <float>
Rejection threshold in dispersion relation fit (pixel) (float; default: 0.7). The
full name of this option for the EsoRex configuration file is
fors.fors_calib.wreject [default = 0.7].
--wmode <long>
Interpolation mode of wavelength solution applicable to LSS-like data (0 = no
interpolation, 1 = fill gaps, 2 = global model) (long; default: 2). The full name
of this option for the EsoRex configuration file is fors.fors_calib.wmode [default
= 2].
--wmosmode <long>
Interpolation mode of wavelength solution (0 = no interpolation, 1 = local (slit)
solution, 2 = global model) (long; default: 0). The full name of this option for
the EsoRex configuration file is fors.fors_calib.wmosmode [default = 0].
--wcolumn <str>
Name of line catalog table column with wavelengths (str; default: ´WLEN´). The full
name of this option for the EsoRex configuration file is fors.fors_calib.wcolumn
[default = WLEN].
--ignore_lines <str>
Catalog lines nearest to wavelengths in this list will be ignored for wavelength
calibration (str; default: ´´). The full name of this option for the EsoRex
configuration file is fors.fors_calib.ignore_lines [default = ].
--cdegree <long>
Degree of spectral curvature polynomial (long; default: 0). The full name of this
option for the EsoRex configuration file is fors.fors_calib.cdegree [default = 0].
--cmode <long>
Interpolation mode of curvature solution applicable to MOS-like data (0 = no
interpolation, 1 = fill gaps, 2 = global model) (long; default: 1). The full name
of this option for the EsoRex configuration file is fors.fors_calib.cmode [default
= 1].
--startwavelength <float>
Start wavelength in spectral extraction (float; default: 0.0). The full name of
this option for the EsoRex configuration file is fors.fors_calib.startwavelength
[default = 0.0].
--endwavelength <float>
End wavelength in spectral extraction (float; default: 0.0). The full name of this
option for the EsoRex configuration file is fors.fors_calib.endwavelength [default
= 0.0].
--slit_ident <bool>
Attempt slit identification for MOS or MXU (bool; default: True). The full name of
this option for the EsoRex configuration file is fors.fors_calib.slit_ident
[default = True].
--stack_method <str>
Frames combination method (str; default: ´sum´). The full name of this option for
the EsoRex configuration file is fors.fors_calib.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_calib.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_calib.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_calib.kiter [default =
999].
--s_nknots <long>
Number of knots in flat field fitting splines along spatial direction (long;
default: -1). The full name of this option for the EsoRex configuration file is
fors.fors_calib.s_nknots [default = -1].
--sradius <long>
Smooth box radius for flat field along spatial direction (used if s_knots < 0)
(long; default: 10). The full name of this option for the EsoRex configuration file
is fors.fors_calib.sradius [default = 10].
--d_nknots <long>
Number of knots in flat field fitting splines along dispersion direction (long;
default: -1). The full name of this option for the EsoRex configuration file is
fors.fors_calib.d_nknots [default = -1].
--dradius <long>
Smooth box radius for flat field along dispersion direction (if d_knots < 0) (long;
default: 10). The full name of this option for the EsoRex configuration file is
fors.fors_calib.dradius [default = 10].
--splfit_threshold <float>
Threshold percentage for flat spline fittingwith respect to the maximum (float;
default: 0.01). The full name of this option for the EsoRex configuration file is
fors.fors_calib.splfit_threshold [default = 0.01].
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-4.7.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_wave_calib_lss(7), fors_img_sky_flat(7),
fors_resample(7), fors_config(7), fors_extract_objects(7), fors_wave_calib(7),
fors_detect_objects(7), fors_pmos_science(7), fors_zeropoint(7), fors_extract_slits(7),
fors_extract(7), fors_remove_bias(7), fors_subtract_sky(7), fors_normalise_flat(7),
fors_photometry(7), fors_img_screen_flat(7), fors_dark(7), fors_subtract_sky_lss(7),
fors_trace_flat(7), fors_flatfield(7), fors_img_science(7), fors_detect_spectra(7),
fors_sumflux(7), fors_pmos_extract(7), fors_align_sky_lss(7), fors_bias(7),
fors_align_sky(7), fors_pmos_calib(7), fors_spec_mflat(7), fors_science(7)
VERSION
fors_calib 4.11.12
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) 2002-2010
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