first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method S X 0.730000 0.137000 Bus-DeMeo VIS Erasmus 2019ApJS..242...15E PHOT S X 0.734000 0.137000 Bus-DeMeo VIS Erasmus 2018ApJS..237...19E PHOT