21.5 SPECTRAL_CLEAN

[BUNDLES\]SPECTRAL_CLEAN MODE [Control ]

Perform a Clean with different spectral scales.

MODE can be

      FFT       Clean the Fourier Transform of the spectra
      WAVE      Clean a Wavelet Transform of the spectra
      DUAL Ns   Clean at two different spectral resolutions
      MULTI Ns  Clean at two (or more) spectral resolutions.

Instead of Cleaning separately individual channels, SPECTRAL_CLEAN cleans either Spectral Transform of the data cube (along the velocity axis), and performs the inverse transformation to restore the channel-based Clean components.

The SPECTRAL_CLEAN method can improve deconvolution of spectrally well resolved faint line wings, yielding more accurate integrated line fluxes, at the cost of some extra computations. However, SPECTRAL_CLEAN can be hampered by strong velocity gradient, that require supports that differ widely among channels.

Standard CLEAN control parameters apply. However the METHOD must allow retrieving Clean Componentes: MRC is thus excluded. SPECTRAL_CLEAN can also work on Mosaics.