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: http://www.stsci.edu/documents/dhb/web/c24_stiscalib.fm2.html
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Below we present a series of flow charts which provide a more complete overview of the processing of data through the calstis pipeline, starting with the fundamental step of two-dimensional image reduction.
Figure 21.2: Schematic of calstis for Secondary Image Processing
For spectroscopic exposures, calstis will process the associated wavelength calibration (wavecal) exposure to determine the zero point offset of the wavelength and spatial scales in the science image, thereby correcting for the lack of repeatability of the mode select mechanism (MSM) or for thermal drift. The accompanying wavecal observations are stored in the rootname_wav.fits file.Figure 21.3: Schematic of calstis for Contemporaneous Wavecals
Two-dimensional spectral processing produces a flux-calibrated, rectified spectroscopic image with distance along the slit running linearly along the y axis and dispersion running linearly along the x axis.Figure 21.4: Schematic of calstis for Spectroscopic Data