FORS_IMG_SKY_FLAT(7)

💫 fors_img_sky_flat — the manual, but make it slay ✨

okay bestie so this is FORS_IMG_SKY_FLAT(7), from the fors recipes section of the manual pages. it's literally the glow-up guide for computing a master img_sky_flat frame. no cap. 🎀

---

🌈 SYNOPSIS

esorex fors_img_sky_flat [OPTIONS] FILE.sof

that's it. that's the whole summoning ritual. 🦋

---

💖 DESCRIPTION

so here's the tea on what goes in and what comes out. 🍓

Input files:

• DO category: SKY_FLAT_IMG — Type: Raw — Explanation: Jittered sky flat fields — Number: 1+
• DO category: MASTER_BIAS — Type: FITS image — Explanation: Master bias — Number: 1

Output files:

• DO category: MASTER_SKY_FLAT_IMG — Data type: FITS image — Explanation: Master sky flat field

so you feed it at least one raw jittered sky flat and exactly one master bias, and it hands you back a master sky flat field. the math is mathing. 💅

---

✨ OPTIONS ✨

every single one, bestie, i'm not skipping a crumb:

• --stack_method <str> — Frames combination method (str; default: ´median´). The full name of this option for the EsoRex configuration file is fors.fors_img_sky_flat.stack_method [default = median].
• --minrejection <int> — Number of lowest values to be rejected (int; default: 1). The full name of this option for the EsoRex configuration file is fors.fors_img_sky_flat.minrejection [default = 1].
• --maxrejection <int> — Number of highest values to be rejected (int; default: 1). The full name of this option for the EsoRex configuration file is fors.fors_img_sky_flat.maxrejection [default = 1].
• --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_img_sky_flat.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_img_sky_flat.khigh [default = 3.0].
• --kiter <int> — Max number of iterations in ksigma method (int; default: 999). The full name of this option for the EsoRex configuration file is fors.fors_img_sky_flat.kiter [default = 999].

🫶 heads up bestie: you can lowkey make a configuration file holding all these options with your own suitable default values. for the deets, go check what esorex --help tells you. it's giving organized. 📝

---

👑 SEE ALSO

the full documentation for the fors pipeline can be downloaded as a PDF file using this URL, fr fr:

ftp://ftp.eso.org/pub/dfs/pipelines/fors/fors-pipeline-manual-4.9.pdf

an overview over the existing ESO pipelines lives right here on the web page:

https://www.eso.org/sci/software/pipelines/

basic documentation about the EsoRex program is hanging out at the esorex (1) man page. 🌸

and yes you can call the pipelines from python using the python-cpl package — see https://packages.python.org/python-cpl/index.html for further information. python girlies stay winning 🐍

the other recipes of the fors pipeline are — deep breath, this is a long guest list — fors_align_sky(7), fors_align_sky_lss(7), fors_bias(7), fors_calib(7), fors_config(7), fors_dark(7), fors_detect_objects(7), fors_detect_spectra(7), fors_extract(7), fors_extract_objects(7), fors_extract_slits(7), fors_flatfield(7), fors_img_science(7), fors_img_screen_flat(7), fors_normalise_flat(7), fors_photometry(7), fors_pmos_calib(7), fors_pmos_extract(7), fors_pmos_science(7), fors_remove_bias(7), fors_resample(7), fors_science(7), fors_spec_mflat(7), fors_subtract_sky(7), fors_subtract_sky_lss(7), fors_sumflux(7), fors_trace_flat(7), fors_wave_calib(7), fors_wave_calib_lss(7), fors_zeropoint(7). the whole friend group. 💜

---

⭐ VERSION

fors_img_sky_flat 5.5.7

---

🧚 AUTHOR

Jonas M. Larsen <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>. they're literally the same inbox but okay, both doors lead there. 💌

---

💀 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.

🚨 bestie the ALL CAPS in there is not me being dramatic, that's the actual license being very serious about there being NO WARRANTY. respect it. 🙏

---

and that's a wrap! fors_img_sky_flat, version 5.5.7 — go make some iconic master sky flats, you absolute legend. 💖✨🎀🦋🌸💅🫶😭🔥👑🌈⭐💀🙈🍓🧚💜