first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method K K 0.6548 0.6548 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT X 0.430 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT