fors_spec_mflat7

Usage

Overview

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 <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_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 5.5.6