first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method S C 0.690000 0.290000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC S K Tholen VIS Clark 1995Icar..113..387C PHOT Sq Bus VIS Bus 2002Icar..158..146B SPEC Sq T Bus VISNIR MotheDiniz 2008Icar..195..277M SPEC