first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method S X 0.681000 0.171000 Bus-DeMeo VIS Erasmus 2019ApJS..242...15E PHOT S X 0.685000 0.172000 Bus-DeMeo VIS Erasmus 2018ApJS..237...19E PHOT