first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method Ch Bus-DeMeo VISNIR Bourdelle de Micas 2022A&A...665A..83B SPEC X Bus VIS Luo 2024AJ....167...13L SPEC X Bus VIS Luo 2024AJ....167...13L SPEC X T Bus VIS Luo 2024AJ....167...13L SPEC X T Bus VIS Luo 2024AJ....167...13L SPEC