SET SPW

        CLIC\SET SPW CLIC\SET SPW n1 n2 ...   [/WINDOW  f1  l1  f2  l2  ...]
    [/NOSELECT]
        CLIC\SET SPW LINE|CONT
        CLIC\SET SPW ALL
        Selects  the  spectral  windows  for which data will be displayed by
    command PLOT. Valid codes are continuum spw  numbers  (C001,  C002,  ...
    C008) or line spw numbers (L001, L002, ... L008). These are logical num-
    bers, so one should select e.g. L01 to L04 if four correlator units were
    used,  independentely  from  the physical units actually used. This is a
    classical trap, especially with the old receiver system (<2007): if e.g.
    units 1 to 5 were used on Receiver 1 and units 6 to 8 on Receiver 2, the
    corresponding spw will be L01 to L05 for the Receiver 1 scan, and L01 to
    L03 for the Receiver 2 scan.

    Spectral  windows may be grouped by typing e.g. "SET SPW n1 to n2 and n3
    n4". Here, two quantities will be plotted. The first one is  either  the
    average  of  spw n1 to n2 and n3 (in time mode), or the concatenation of
    spectral data from spw n1 to n2 and n3 (in spectral  mode).  The  second
    quantity plotted is spw n4.

    SET  SPW  LINE|CONT will switch all spw to their line/continuum counter-
    part, e.g. L01 to L04 will be changed to C01 to C04  by  SET  SPW  CONT.
    Done by SET X I_F

    SET SPW n1 /NOSELECT will select spectral window n1 while keeping previ-
    ous selection mode (i.e. BB or IF selection) which allows  to  select  a
    high-spectral  resolution  spectral window for delay determination (that
    needs BB or IF selection). This will update the baseband or IF value  if
    necessary.

    A number of useful shortenings are available:

      -  SET SPW ALL will automatically select all the subbands in the first
        scan of the current index, for each command accessing the data.  The
        subbands are concatenated (equivalent to e.g.  SET SPW L01 to L06).