first_spec_class	second_spec_class	prob_first_spec_class	prob_second_spec_class	taxonomy	wavelength	author	ref	method
S				Bus	VIS	Binzel	2004M&PS...39..351B	SPEC
S				Bus	VIS	Binzel	2019Icar..324...41B	SPEC
S				Bus	VIS	Bus	2002Icar..158..146B	SPEC