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Modify the rest frequency(ies) and recompute the velocity scale accordingly for all buffers, or the specified SIC variable or Gildas file.
If Arg is a number or scalar variable, it should contain the new rest frequency in MHz. In this mode, there may be other arguments to specify e.g. the VELOCITY or LINENAME at the same time.
If it is the name of a SIC array variable, variable Arg must be a 1-D double precision array that contains frequencies (in MHz) for every channel of the UV data to which it applies. This is by default the current UV data if not specified. This mode allows to handle irregular frequency sampling that occurs e.g. in JVLA data sets. No further argument is allowed in this mode.