first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method S X 0.555000 0.195000 Bus-DeMeo VIS Erasmus 2019ApJS..242...15E PHOT S X 0.563000 0.198000 Bus-DeMeo VIS Erasmus 2018ApJS..237...19E PHOT