DOKK / manpages / debian 12 / cpl-plugin-uves-doc / uves_cal_mflat.7.en
UVES_CAL_MFLAT(7) uves recipes UVES_CAL_MFLAT(7)

uves_cal_mflat - Creates the master flat field frame

esorex uves_cal_mflat [OPTIONS] FILE.sof

This recipe creates a master flat frame by 1) subtracting the master bias frame from each flat field frame, 2) dividing each flat field frame by the
exposure time for that frame, 3) taking the median of all bias subtracted,
normalized raw
flat frames, 4) optionally subtracting the master dark frame, and 5) subtracting
the background to get the bias subtracted, optionally dark subtracted, normalized, background subtracted master flat-field frame. Symbolically,
masterflat = median( (flat_i - masterbias)/exptime_i ) - masterdark/exptime
- background.

The input flat field frames must have same tag which must match (I|D|S|T|SCREEN|)FLAT_(BLUE|RED), for example TFLAT_BLUE or FLAT_RED. Also, a master bias (MASTER_BIAS_xxxx) and ordertable (ORDER_TABLE_xxxx) must be provided for each chip (xxxx = BLUE, REDL, REDU). A master dark frame (MASTER_(P)DARK_xxxx) may optionally be provided. On blue input the recipe computes one master flat field frame; on red input the recipe produces a master flat field frame for each chip (MASTER_FLAT_xxxx, MASTER_IFLAT_xxxx, MASTER_DFLAT_xxxx, MASTER_TFLAT_xxxx or MASTER_SCREEN_FLAT_xxxx).

Background measuring method. If equal to ´median´ the background is sampled using the median of a subwindow. If ´minimum´, the subwindow minimum value is used. If ´no´, no background subtraction is done. (str; default: ´median´). The full name of this option for the EsoRex configuration file is uves_cal_mflat.backsub.mmethod [default = median].
This is the number of columns in interorder space used to sample the background. (int; default: 82). The full name of this option for the EsoRex configuration file is uves_cal_mflat.backsub.npoints [default = 82].
The height (in pixels) of the background sampling window is (2*radiusy + 1). This parameter is not corrected for binning. (int; default: 2). The full name of this option for the EsoRex configuration file is uves_cal_mflat.backsub.radiusy [default = 2].
Degree of interpolating splines. Currently only degree = 1 is supported (int; default: 1). The full name of this option for the EsoRex configuration file is uves_cal_mflat.backsub.sdegree [default = 1].
If spline interpolation is used to measure the background, the x-radius of the post-smoothing window is (smoothx * image_width). Here, ´image_width´ is the image width after binning. If negative, the default values are used: (25.0/4096) for blue flat-field frames, (50.0/4096) for red flat-field frames, (300.0/4096) for blue science frames and (300.0/4096) for red science frames. (float; default: -1.0). The full name of this option for the EsoRex configuration file is uves_cal_mflat.backsub.smoothx [default = -1.0].
If spline interpolation is used to measure the background, the y-radius of the post-smoothing window is (smoothy * image_height). Here, ´image_height´ is the image height after binning. If negative, the default values are used: (100.0/2048) for blue flat-field frames, (300.0/2048) for red flat-field frames, (200.0/2048) for blue science frames and (500.0/2048) for red science frames. (float; default: -1.0). The full name of this option for the EsoRex configuration file is uves_cal_mflat.backsub.smoothy [default = -1.0].
Whether or not to save intermediate results to local directory (bool; default: False). The full name of this option for the EsoRex configuration file is uves.debug [default = False].
Method used to build master frame (str; default: ´explevel´). The full name of this option for the EsoRex configuration file is uves_cal_mflat.norm_method [default = explevel].
Any plots produced by the recipe are redirected to the command specified by this parameter. The plotting command must contain the substring ´gnuplot´ and must be able to parse gnuplot syntax on its standard input. Valid examples of such a command may include ´gnuplot -persist´ and ´cat > mygnuplot$$.gp´. A finer control of the plotting options can be obtained by writing an executable script, e.g. my_gnuplot.pl, that executes gnuplot after setting the desired gnuplot options (e.g. set terminal pslatex color). To turn off plotting, set this parameter to ´no´ (str; default: ´no´). The full name of this option for the EsoRex configuration file is uves.plotter [default = no].
For RED arm data process the redl, redu, or both chip(s) (str; default: ´both´). The full name of this option for the EsoRex configuration file is uves.process_chip [default = both].

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.

The full documentation for the uves pipeline can be downloaded as a PDF file using the following URL:

ftp://ftp.eso.org/pub/dfs/pipelines/uves/uves-pipeline-manual-6.1.8.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 uves pipeline are flames_cal_mkmaster(7), flames_cal_orderpos(7), flames_cal_predict(7), flames_cal_prep_sff_ofpos(7), flames_cal_wavecal(7), flames_obs_redchain(7), flames_obs_scired(7), flames_utl_unpack(7), uves_cal_cd_align(7), uves_cal_mbias(7), uves_cal_mdark(7), uves_cal_mflat_combine(7), uves_cal_mkmaster(7), uves_cal_orderpos(7), uves_cal_predict(7), uves_cal_response(7), uves_cal_tflat(7), uves_cal_wavecal(7), uves_obs_redchain(7), uves_obs_scired(7), uves_utl_ima_arith(7), uves_utl_remove_crh_single(7)

uves_cal_mflat 6.1.8

Jonas M. Larsen <cpl@eso.org>

Please report any problems to cpl@eso.org. Alternatively, you may send a report to the ESO User Support Department <usd-help@eso.org>.

This file is part of the FLAMES/UVES Pipeline Copyright (C) 2004, 2005, 2006, 2007 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

6.1.8 uves_cal_mflat