Long slit and multi-slit data reduction.
Long slit and multi-slit instruments produce one order per object observed. Listed on the left are the single order spectrometers at Keck with the packages associated.
For NIRSPEC, we are considering the low-resolution, single order mode where the cross-disperser is used to spread out the light. The echelle mode is listed in multi-order spectra.
PypeIt is written to be a general purpose package. It handles a number of instruments, including many non-Keck ones.