Compute arclines tilt and instrument resolution
This recipe detects and follow arc lines in a fully illuminated slit frame.
Prepare PRE structures.
Subtract the master Dark (UVB, VIS and NIR) (xsh_subtract_dark) Substract the master Bias (UVB and VIS)(amodigli@pc014007$ vi xsh_wavecal_fail.sofxsh_substract_bias) Divide by Flat.
Detect and follow arc lines.
Create an object for the recipe xsh_wavecal.
import cpl
xsh_wavecal = cpl.Recipe("xsh_wavecal")
If ‘no’, temporary files are deleted. (str; default: ‘no’) [default=”no”].
Additional xshooter debug level. One of ‘none’, ‘low’, ‘medium’, ‘high’ (str; default: ‘none’) [default=”none”].
Add timestamp to product file name. (bool; default: False) [default=False].
Integer representation of the bits to be considered bad when decoding the bad pixel mask pixel values. Most frequent codes relevant for the user: 0: good pixel, 8: pick-up noise, 16: cosmic-ray removed, 32: cosmic-ray unremoved, 128: calibration file defect, 256: hot pixel, 512: dark pixel, 4096: A/D converted saturation, 32768: non linear pixel, 1048576: extrapolated flux in NIR, 4194304: Interpolated flux during extraction. (long; default: 2144337919) [default=2144337919].
pre-overscan correction.0: no correction1: mean overscan correction2: mean prescan correction3: (mean pre+mean overscan)/2 correction (long; default: 1) [default=1].
Half window size (HWS) in pixels (Y axis) of search window for each line. (long; default: 6) [default=6].
Nb of pixels suppressed (X) from edges of search window. (long; default: 3) [default=3].
Minimum Signal over Noise ratio at center to keep the line (6 for IFU, 15 for SLIT). (float; default: -1.0) [default=-1.0].
Multiple of sigma in sigma clipping for evaluate tilt (float; default: 2.5) [default=2.5].
Number of iterations in sigma clipping for evaluate tilt (long; default: 5) [default=5].
Minimal fractions of points accepted / total in sigma clipping for evaluate tilt (float; default: 0.7) [default=0.7].
Multiple of sigma in sigma clipping for evaluate spectral resolution (float; default: 2.5) [default=2.5].
Number of iterations in sigma clipping for evaluate spectral resolution (long; default: 5) [default=5].
Minimal fractions of points accepted / total in sigma clipping for evaluate spectral resolution (float; default: 0.7) [default=0.7].
The following code snippet shows the default settings for the available parameters.
import cpl
xsh_wavecal = cpl.Recipe("xsh_wavecal")
xsh_wavecal.param.keep_temp = "no"
xsh_wavecal.param.debug_level = "none"
xsh_wavecal.param.time_stamp = False
xsh_wavecal.param.decode_bp = 2144337919
xsh_wavecal.param.pre_overscan_corr = 1
xsh_wavecal.param.followarclines_search_window_half_size = 6
xsh_wavecal.param.followarclines_order_edges_mask = 3
xsh_wavecal.param.followarclines_min_sn = -1.0
xsh_wavecal.param.tilt_clip_kappa = 2.5
xsh_wavecal.param.tilt_clip_niter = 5
xsh_wavecal.param.tilt_clip_frac = 0.7
xsh_wavecal.param.specres_clip_kappa = 2.5
xsh_wavecal.param.specres_clip_niter = 5
xsh_wavecal.param.specres_clip_frac = 0.7
You may also set or overwrite some or all parameters by the recipe parameter param, as shown in the following example:
import cpl
xsh_wavecal = cpl.Recipe("xsh_wavecal")
[...]
res = xsh_wavecal( ..., param = {"keep_temp":"no", "debug_level":"none"})
See also
cpl.Recipe for more information about the recipe object.
Please report any problems to L.Guglielmi. Alternatively, you may send a report to the ESO User Support Department.
This file is part of the X-shooter Instrument Pipeline Copyright (C) 2006 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Code author: L.Guglielmi <amodigli@eso.org>