LFIND

        [WEEDS\]LFIND [SPECIES [FMIN FMAX]] [/SORTBY ORDER] [/ENERGY ENERGY]
    [/AIJ AMIN] [/ORIGIN OriginName]

    Find the lines within a frequency range and create  a  line  index.  The
    command  looks  for the lines between FMIN and FMAX (default is the fre-
    quency range covered by the current R spectrum) in the database selected
    with the USE IN command.

    Arguments:
        SPECIES  the name of the species. Default is "All".
        FMIN     the  minimum  frequency  in  MHz.  Default is the current R
                 spectrum minimum limit.
        FMAX     the maximum frequency in MHz.  Default  is  the  current  R
                 spectrum maximum limit.

    Options:
        /SORTBY   sort the lines according to ORDER, which can be any combi-
                  nation of "frequency", "energy" and "aeinstein",  and  all
                  the subsequent permutations.

        /ENERGY   refine  the  search to lines with upper level energy lower
                  than ENERGY, expressed in Kelvins.

        /AIJ      refine the search to lines  with  einstein  A  coefficient
                  greater than AMIN, expressed s-1.

        /ORIGIN   refine the search to lines originally from the named data-
                  base only.

    As an output, the structure LINES% will contain the content of the  cur-
    rent index. See HELP SELECT for details.