first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method X C 0.717000 0.241000 Bus-DeMeo VIS Erasmus 2019ApJS..242...15E PHOT X X 0.3417 0.3417 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT