get_spectralspec_to_spwid_map

get_spectralspec_to_spwid_map(spws: Collection) → DefaultDict[str | None, list[int]]

Returns a dictionary of spectral specs mapped to corresponding spectral window IDs for requested list of spectral window objects.

Parameters:

spws -- list of spectral window objects

Returns:

dictionary with spectral spec as keys, and corresponding

list of spectral window IDs as values.