first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method X C 0.514000 0.259000 Bus-DeMeo VIS Erasmus 2019ApJS..242...15E PHOT X C 0.531000 0.252000 Bus-DeMeo VIS Erasmus 2018ApJS..237...19E PHOT