first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method X C 0.547000 0.360000 Bus-DeMeo VIS Erasmus 2018ApJS..237...19E PHOT X C 0.555000 0.353000 Bus-DeMeo VIS Erasmus 2019ApJS..242...15E PHOT