CATALOG

        [DISPLAY\]CATALOG  [?|NONE|FileName [.. [FileNameN]] [/SORT OutFile [In-
    terval]

    Define or list the current catalog(s) for spectral line  identification.   A
    catalog is a file in the "Astro" GILDAS format, as used in programs ASTRO or
    CLASS  in  the  GILDAS suite, or in  the LINEDB\ data format.  With argument
    NONE, the active catalogs are discarded.  With no arument or argument ?, the
    command will just list the names of the current catalog(s).

    There can be only ONE Astro catalog connected at a time, and it is exclusive
    of any LINEDB data bases. On the opposite, there may be several LINDEB  data
    bases specified by the CATALOG command.

    At initialization, IMAGER search for $HOME/imager.linedb as default catalog,
    then  gag_data:imager.linedb if not found. If the specified catalog does not
    exist, no spectral line identification will be done.

    Caution: although direct use of the LINEDB\USE command is also  possible  to
    define  the LINEDB catalog(s), this is not recommended as it may result with
    possible conflicts with an Astro catalog.