UV_MERGE /MODE

          [ADVANCED]\UV_MERGE OutFile /FILES In1 In2 ... Inn
        /MODE [LINE|STACK|CONCATENATE|INTERSECT|CONTINUUM [Index [Freq]]
        [/SCALES F1 ... Fn] [/WEIGHTS W1 ... Wn ]

      Specify the merging mode.  The default mode is LINE.

      In LINE mode, for spectral line UV tables (more than 1 channel),  the  de-
    fault  is that the spectral lines must have the same Rest Frequency.  Resam-
    pling (in velocity, which is then identical in frequency)  is  done  on  the
    grid of the first UV table In1.

      In mode CONCATENATE, a common spectral axis encompassing those of the ini-
    tial  UV  tables  is  defined,  and all UV tables are resampled on this one.
    Spectral resolution is set by the first UV table.

      In mode INTERSECT, the common spectral axis is  the  intersection  of  the
    coverage of all UV tables. Spectral resolution is set by the first UV table.

      In mode STACK, the Rest Frequencies can differ. Resampling is then done in
    velocity,  and  the (u,v) coordinates scaled as the Rest Frequency ratios to
    conserve the angular resolution of the data.  The /SCALES and  /WEIGHT  fac-
    tors  can be used to incorporate prior knowledge of the expected line ratios
    to optimize S/N.

      For continuum UV tables (1 channel or option /MODE CONTINUUM), a  spectral
    index can be specified, as well as a reference Frequency.  (u,v) coordinates
    are  scaled  appropriately,  as  well  as Flux and Weights in this case. The
    /SCALES and /WEIGHTS factors are applied on top of this  automatic  spectral
    index scaling. Input Line UV Tables are treated as multi-frequency Continuum
    ones (as in UV_CONTINUUM command).