The filler is able to import data created by versions1 of the HIPE
software equal or newer than 12. Older versions are rejected by
CLASS. However, it is recommended to retrieve the latest Herschel-HIFI FITS files
(version 14, expected mid-2016) from the Herschel Science Archive, as
there were several fixes (e.g. missing keywords) added since the
versions 12 and 13. This means the resulting spectra in CLASS will
be incomplete (e.g. null values, in particular in the Herschel-HIFI
section) or approximate for versions 12 and 13. If this happens,
CLASS will issue warnings when it had to choose the default value
for a parameter. Defaults are documented in the look-up tables in the
Section .