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Extract UV tables around each spectral line available in the CATALOG and covered by the frequency setup. Continuum emission is (empirically) separated from Line emission using the UV_PREVIEW, UV_BASELINE / UV_FILTER mechanism.
This step is only needed when direct image analysis in the UV plane is required. The resulting UV tables can however be used as a complete but compact set of UV tables for any further use, especially in SPLIT mode where many initial channels may just contain noise.
This is Step 6, NEXT step is INDEX