Preparation of Data Reduction

The data reduction of echelle spectra is performed mainly with the tasks of noao.imred.echelle and noao.twodspec.longslit packages. Before starting the data reduction with the IRCS echelle data, one has to investigate the aperture width, intensity level, dispersion direction, interval between apertures, etc., and then sets the parameters as in Figure 27.

Figure 27: Setting basic parameters for IRCS echelle spectra when the slit length is 3$.^{''}$89. The pixel scale of the echelle spectra along the slit length is about 0$.^{''}$060.