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SPW /FREQUENCY 

    [NOEMAOFFLINE\]SPW /FREQUENCY Fcent dF

    Define  a spectral window from Fmin=Fcent-dF/2 to Famx=Fcent+dF/2 in the
    current frequency frame (as defined with SET FREQUENCY command).   Fcent
    and dF must be in GHz.  Fmin and Fmax must be in the same baseband.