first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method C Bus VIS Bus 2002Icar..158..146B SPEC M 0.870000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC X X 0.8672 0.8672 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT