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Spectral calibrations

1) Wavelength calibrations

As shown in the Cook Book, it is recommended to make at least one set of spectral calibrations per telescope position during the night (before and/or after a set of spectral science exposures on a given object). Typical exposure times and typical results for the blue and red ranges are provided. Annotated wavelength maps of calibration spectra of HgArXe lamps are also given here, useful to make your own wavelength calibration if you do not plan to use the local spectral reduction tool.

2) Spectral flatfields

Similarly to imaging flatfields, spectral flatfields are used to correct the CCD pixel to pixel response along the y-axis (not wavelength dispersed). They are more carefully described in the Cook Book.