first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method S X 0.675000 0.221000 Bus-DeMeo VIS Erasmus 2019ApJS..242...15E PHOT S X 0.678000 0.216000 Bus-DeMeo VIS Erasmus 2018ApJS..237...19E PHOT