To reduce the HDS data, observers are free to use any software or platform of their own choice. However, a set of IRAF scripts adopted for the HDS specifically has been developed and is described on this Web page. These scripts are available on the summit during the observations for the purpose of a quick data evaluation. They may produce continuum-normalized or flux-calibrated spectra, either combined or in a 2D order-to-order format. The spectra are wavelength-calibrated on the basis of ThAr lamp expositions. No specific iodine-based reduction is available.
A general description of echelle data reduction in IRAF,
is available in the Data Reduction Manual
here.