badorders
badorders
badorders constructs a bad pixel file containing the positions of spectral features from other spectral orders that may overlay the desired spectrum.
USAGE | badorders -o observset [-i input_badpix_file] -f output_badpix_file
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INPUT |
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OUTPUT | output_badpix_file.badpix is the new bad pixel file created
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PARAMETERS |
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Details:
badorders calculates the location and extent of spectral features from other orders of a spectrum which need to be blocked during the spectral reduction process. It creates a bad pixel file which can be used as input to the programs Sflats and subsky, in place of the standard bad pixel file which exists for each dewar. If no other input bad pixel file is specified, the standard bad pixel file for the dewar in use is used as a starting point, to which new bad pixel groups are added for each spectral feature to be blocked. Note that the binning of the output bad pixel file will be the same as that of the input bad pixel file, so that if a non-standard input bad pixel files is used with, e.g. 2 x 2 binning, the output bad pixel file will also have 2 x 2 binning.
badorders uses the information in the observation definition files to calculate
the location and extent of each spectral feature. For zero order, the blocked
region extends between the wavelengths specified by lambda0 and lambda1. For
higher orders, the blocked region is located at the wavelength of each line
specified in linefile, and has a width in wavelength of +/- hwidth angstroms.
An appropriate observation definition file must be created for each order, and
will have the name observset_n.obsdef
, where n
is the order. Each observation
definition file must specify the order, and will usually specify an individual
dewar offset file appropriate for that order image, since there will probably
be small offsets between the true positions of the features in each order, and
those predicted by the optical model. Consult the COSMOS Cookbook for hints
about constructing these files.