first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method Ch Bus VIS Bus 2002Icar..158..146B SPEC P C 0.740000 0.260000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC X 0.982 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT