Approximate fractions of the main taxonomic types and ordinary chondrites. In this figure, asteroids in the S-complex include Q-types and a new subclass of objects introduced in the present study called Sx-types. Asteroids in the C/X-complex include those with ambiguous C- or X-complex classification plus asteroids classified as Xk-, Xn-, and B-types. The fraction corresponding to “others” includes K-types and objects whose taxonomic classification is indeterminate.