first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method C S 0.671000 0.166000 Bus-DeMeo VIS Erasmus 2019ApJS..242...15E PHOT V V 0.3274 0.3274 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT