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 C S 0.840000 0.120000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC X 1.000 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT