SPECTRAL_CLEAN FFT
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SPECTRAL_CLEAN FFT

              [BUNDLES\]SPECTRAL_CLEAN FFT

        Clean the Fourier Transform along the spectral axis of the  DIRTY  cube,
        and  transform  back  the  Clean  components to retrieve the per-channel
        Clean components. The final Clean image is produced using UV_RESTORE.

        The usual Clean convergence parameters apply, although  CLEAN_NKEEP  may
        need small adjustment because of the non-positive nature of the signal.

        The  Fourier  Transform  leads  to a Complex valued data set, whose Her-
        miticity is not considered. Real and Imaginary parts are  cleaned  sepa-
        rately, so the method is about twice slower than a standard Clean.