first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method L Bus-DeMeo NIR Binzel 2019Icar..324...41B SPEC L K 0.830000 0.140000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC Xk Bus-DeMeo VIS Perna 2018P&SS..157...82P SPEC