.TH FORS_IMG_SCREEN_FLAT "7" "5.5.7" "fors_img_screen_flat" "fors recipes" .SH NAME fors_img_screen_flat \- Compute master screen flat frame .SH SYNOPSIS esorex .B fors_img_screen_flat [OPTIONS] FILE.sof .SH DESCRIPTION After bias subtraction, the input flat field frames are combined using the given stack method. The combined frame is finally normalised dividing it by its large scale illumination trend. The large scale trend is obtained by applying a median filter with a large kernel. To avoid boundary effects, the median filter is applied only to the specified region. .PP The overscan regions, if present, are removed from the result. .PP Input files: DO category: Type: Explanation: Required: SCREEN_FLAT_IMG Raw Screen flat field Y MASTER_BIAS Raw Master bias Y Output files: DO category: Data type: Explanation: MASTER_SCREEN_FLAT_IMG FITS image Master screen flat field .SH OPTIONS .TP \fB\-\-stack_method\fR \fI\fR Frames combination method (str; default: \'average\'). The full name of this option for the EsoRex configuration file is \fBfors.fors_img_screen_flat.stack_method\fR [default = \fIaverage\fR]. .TP \fB\-\-minrejection\fR \fI\fR Number of lowest values to be rejected (int; default: 1). The full name of this option for the EsoRex configuration file is \fBfors.fors_img_screen_flat.minrejection\fR [default = \fI1\fR]. .TP \fB\-\-maxrejection\fR \fI\fR Number of highest values to be rejected (int; default: 1). The full name of this option for the EsoRex configuration file is \fBfors.fors_img_screen_flat.maxrejection\fR [default = \fI1\fR]. .TP \fB\-\-klow\fR \fI\fR Low threshold in ksigma method (float; default: 3.0). The full name of this option for the EsoRex configuration file is \fBfors.fors_img_screen_flat.klow\fR [default = \fI3.0\fR]. .TP \fB\-\-khigh\fR \fI\fR High threshold in ksigma method (float; default: 3.0). The full name of this option for the EsoRex configuration file is \fBfors.fors_img_screen_flat.khigh\fR [default = \fI3.0\fR]. .TP \fB\-\-kiter\fR \fI\fR Max number of iterations in ksigma method (int; default: 999). The full name of this option for the EsoRex configuration file is \fBfors.fors_img_screen_flat.kiter\fR [default = \fI999\fR]. .TP \fB\-\-xradius\fR \fI\fR Median filter x radius (unbinned pixels) (int; default: 50). The full name of this option for the EsoRex configuration file is \fBfors.fors_img_screen_flat.xradius\fR [default = \fI50\fR]. .TP \fB\-\-yradius\fR \fI\fR Median filter y radius (unbinned pixels) (int; default: 50). The full name of this option for the EsoRex configuration file is \fBfors.fors_img_screen_flat.yradius\fR [default = \fI50\fR]. .TP \fB\-\-degree\fR \fI\fR Degree of fitting polynomial (int; default: \-1). The full name of this option for the EsoRex configuration file is \fBfors.fors_img_screen_flat.degree\fR [default = \fI\-1\fR]. .TP \fB\-\-sampling\fR \fI\fR Sampling interval for fitting (int; default: 100). The full name of this option for the EsoRex configuration file is \fBfors.fors_img_screen_flat.sampling\fR [default = \fI100\fR]. .PP 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. .SH SEE ALSO The full documentation for the fors pipeline can be downloaded as a PDF file using the following URL: .IP .B ftp://ftp.eso.org/pub/dfs/pipelines/fors/fors\-pipeline\-manual\-4.9.pdf .PP An overview over the existing ESO pipelines can be found on the web page \fBhttps://www.eso.org/sci/software/pipelines/\fR. .PP Basic documentation about the EsoRex program can be found at the esorex (1) man page. .PP It is possible to call the pipelines from python using the python\-cpl package. See \fBhttps://packages.python.org/python\-cpl/index.html\fR for further information. .PP The other recipes of the fors pipeline are .IR fors_align_sky (7), .IR fors_align_sky_lss (7), .IR fors_bias (7), .IR fors_calib (7), .IR fors_config (7), .IR fors_dark (7), .IR fors_detect_objects (7), .IR fors_detect_spectra (7), .IR fors_extract (7), .IR fors_extract_objects (7), .IR fors_extract_slits (7), .IR fors_flatfield (7), .IR fors_img_science (7), .IR fors_img_sky_flat (7), .IR fors_normalise_flat (7), .IR fors_photometry (7), .IR fors_pmos_calib (7), .IR fors_pmos_extract (7), .IR fors_pmos_science (7), .IR fors_remove_bias (7), .IR fors_resample (7), .IR fors_science (7), .IR fors_spec_mflat (7), .IR fors_subtract_sky (7), .IR fors_subtract_sky_lss (7), .IR fors_sumflux (7), .IR fors_trace_flat (7), .IR fors_wave_calib (7), .IR fors_wave_calib_lss (7), .IR fors_zeropoint (7) .SH VERSION fors_img_screen_flat 5.5.7 .SH AUTHOR Jonas M. Larsen .SH BUG REPORTS Please report any problems to usd\-help@eso.org. Alternatively, you may send a report to the ESO User Support Department . .SH 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