SET FREQUENCY
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SET FREQUENCY

            LAS\SET FREQUENCY Freq1|* [Freq2|*] [SIGNAL|IMAGE]

        Add  a  selection  by  frequency for the command FIND. This criterion is
        suited only for spectroscopic data.

          - SET FREQUENCY Freq1
              select all observations which frequency range intersects the given
              frequency,
          - SET FREQUENCY Freq1 Freq2
              select  all observations which frequency range intersects at least
              partially the given range,
          - SET FREQUENCY * Freq2
              select all observations which frequency range is at least partial-
              ly under Freq2,
          - SET FREQUENCY Freq1 *
              select all observations which frequency range is at least partial-
              ly above Freq1,
          - SET FREQUENCY *
              select all observations i.e. disable the selection  by  frequency.
              This is the default.

        An  optional  keyword  can be added after the values to indicate whether
        the selection should be performed by SIGNAL or  IMAGE  frequencies.  De-
        fault is SIGNAL.

        Users  should  be  aware  that this selection criterion requires to read
        more informations in the observation header, and thus has a  computation
        cost which can become important for large datasets.