CATALOG Linedb

        The  LINEDB  catalog  format is a more flexible facility, which can also
    holds additional information.  On-line spectral databases (JPL and CDMS) are
    directly useable as LINEDB catalogs, although access can  be  long  in  this
    case.

    Scripts  named gag_data:*-linedb.sic are availables as examples to construct
    local data bases from the on-line ones. Beware that  the  on-line  databases
    sometimes  change  their  naming  conventions,  so  that identifying a given
    species by name can be tricky.

    In 2020, access to CDMS was unreliable. It has improved  since.   Access  to
    JPL is operational, but frequencies are not as up-to-date as in CDMS.

    Local  files  in  the JPL ".cat" format can be used, but as of Jan-2020, the
    Einstein coefficients are wrong. They also require a "partfunc.cat"  in  the
    following format (given here for HN-15-C as an example)
    species HN-15-C 28006
    temperatures 300. 225. 150. 75. 37.5 18.75 9.375
    qpart 141.06 105.9 70.797 35.514 17.23 9.135 4.746
    The tag number (28006 here) must match that of the ".cat" file.