first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method D Bus-DeMeo VIS Barucci 2018MNRAS.476.4481B SPEC D Bus-DeMeo VIS Perna 2018P&SS..157...82P SPEC X 0.940000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC