Generally, the ultimate PypeIt spectrum output is a single spectrum per source, fully calibrated and (as desired) with a telluric
performed.
The standard way to generate this file is with the pypeit_coadd_1dspec
script.
The naming of this file is user-generated, i.e. it can be anything you wish.
The header of the primary extension includes the core_meta of PypeIt, e.g. RA, DEC, MJD, and configuration parameters of the instrument.
You view the spectrum using the lt_xspec
script (pypeit_show_1dspec
will not work), which loads the data and launches a GUI from the linetools package. e.g.:
lt_xspec J1217p3905_coadd.fits
Internally, the spectrum for a single object is held by the ~pypeit.onespec.OneSpec
class.
Here is its datamodel, which is written as an astropy.io.fits.BinTableHDU in the first HDU of the file.
All wavelengths are in vacuum and flux units depend on whether fluxing
was performed.