FIND /SWITCHING

        LAS\FIND /SWITCHING Mode

    Select observations according to their switching mode:
      - *: any defined or unknown switch
      - POSITION: position switch
      - FREQUENCY: unfolded frequency switch
      - FOLDED: folded frequency switch
      - WOBBLER: wobbler switch
      - BEAM: beam switch
      - MIXED: special code for mixed modes e.g. after averaging spectra
      - UNKNOWN: if the switching information is missing or no switching
          performed (e.g. CALSKY).

    Note that evaluating the switching mode is unefficient since this infor-
    mation is not saved in the CLASS index, and requires to read each obser-
    vation  header  one  by one. Identifying observations by e.g. their date
    and scan number is more efficient, either by proper bookkeeping  at  the
    telescope, or with a once-for-all use of the /SWITCHING option.