Data Reduction Frequently Asked Questions

My reduced spectra do not cover the wavelength range I expected.

Some grisms (e.g., GRIS_300V) are subject to second order contamination unless they are used with an order separation filter (e.g., GG435). The pipeline will limit the wavelength range of the reduced spectra to the range not affected by the overlap if the filter was not used. The user can change the wavelength range in the interactive window of the fors_calib actor, by editing the startwavelength and/or endwavelength values of the file classified as GRISM_TABLE, or by specifying these parameters on the command line.