The uves_cal_cd_align recipe

uves_cal_cd_align

Synopsis

Measures the reproducability of the cross disperser positioning

Description

Given two input frames (CD_ALIGN_xxx where xxx = BLUE or RED) which contain only one echelle order, this recipe measures the shift in the cross-dispersion direction of that order. For RED input frames, only the lower chip is processed.

The recipe produces a CD_ALIGN_TABLE_xxxx (with xxxx = BLUE or REDL) with columns X: Column number YCENi: Centroid from Gaussian fit (for i = 1,2) SIGMAi: Stdev from Gaussian fit BACKi: Constant background from Gaussian fit NORMi: Normalization constant from Gaussian fit YDIFF: Difference YCEN2 - YCEN1 of centroid positions

and the QC-parameters ESO.QC.YDIFF(AVG|MED|RMS), which are the average, median and root-mean-square of the y-shift, respectively.

Constructor

cpl.Recipe("uves_cal_cd_align")

Create an object for the recipe uves_cal_cd_align.

import cpl
uves_cal_cd_align = cpl.Recipe("uves_cal_cd_align")

Parameters

uves_cal_cd_align.param.debug

Whether or not to save intermediate results to local directory (bool; default: False) [default=False].

uves_cal_cd_align.param.plotter

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’) [default=”no”].

uves_cal_cd_align.param.process_chip

For RED arm data process the redl, redu, or both chip(s) (str; default: ‘both’) [default=”both”].

uves_cal_cd_align.param.steps

Step size in pixels (int; default: 100) [default=100].

uves_cal_cd_align.param.window

The half window height used for Gaussian fitting (int; default: 50) [default=50].

uves_cal_cd_align.param.xborder

Exclude a border region of this size (pixels) (int; default: 200) [default=200].

The following code snippet shows the default settings for the available parameters.

import cpl
uves_cal_cd_align = cpl.Recipe("uves_cal_cd_align")

uves_cal_cd_align.param.debug = False
uves_cal_cd_align.param.plotter = "no"
uves_cal_cd_align.param.process_chip = "both"
uves_cal_cd_align.param.steps = 100
uves_cal_cd_align.param.window = 50
uves_cal_cd_align.param.xborder = 200

You may also set or overwrite some or all parameters by the recipe parameter param, as shown in the following example:

import cpl
uves_cal_cd_align = cpl.Recipe("uves_cal_cd_align")
[...]
res = uves_cal_cd_align( ..., param = {"debug":False, "plotter":"no"})

See also

cpl.Recipe for more information about the recipe object.

Bug reports

Please report any problems to Jonas M. Larsen. Alternatively, you may send a report to the ESO User Support Department.