first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method K 0.565 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT S S 0.5345 0.5345 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT