first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method S S 0.5157 0.5157 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT S X 0.746000 0.183000 Bus-DeMeo VIS Erasmus 2019ApJS..242...15E PHOT