Multi-order spectrometers
These instruments produce mulitple orders per observation, generally to fit the full wavelength range onto the detector while providing more resolution. Because of the fact that a given object will have multiple spectra but the wavelength solution can take advantage of the fact that orders are related, the data reduction packages are specialized.
PypeIt currently supports a couple of multi-order spectrometers, with the goal of supporting all of the instruments at Keck.