The program PLADD may be used to interactively co-add spectra with individual weights. Parts of the spectra which are obviously corrupted, e.g. by cosmics, can be eliminated. The program expects input spectra data file with the convention ¡name¿.ii, where ii is a two digit integer (default is 01). In the case of echelle spectra, ii is the order number:
Example file names to be co-added:
With PLADD, normalized as well as absolute flux spectra can be co-added. The absolute fluxes can be pre-normalized (with a constant value) for the processing. A Savitzky-Golay filter may be invoked to clarify in case of heavy over-sampling.