first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method R 0.990000 Mahlke VISNIR Mahlke 2022A&A...665A..26M SPEC Sr Bus-DeMeo VISNIR DeMeo 2009Icar..202..160D SPEC V Bus VIS Bus 2002Icar..158..146B SPEC