SPECTRAL_CLEAN MULTI

        [BUNDLES\]SPECTRAL_CLEAN MULTI  Ns1 [Ns2 ...]

    Clean a (spectrally) smoothed version of the data cube, then start from this
    result to continue Cleaning with the original spectral resolution.

    To be implemented: the method can be generalized to more  than  1  smoothing
    scale,  by  performing  the smoothing in descending order (Ns1 > Ns2 > ... >
    1).  This may allow to catch signals that have widely different widths.