first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method B Bus VIS Bus 2002Icar..158..146B SPEC C Bus-DeMeo VISNIR Arredondo 2021Icar..36814619A SPEC C B 0.800000 0.200000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC