first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method K 0.449 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT X X 0.5570 0.5210 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT