Laboratory spectral matches for organic spectral shapes observed on Bennu. The most common spectral shapes in the Bennu spectra that we analyzed are well matched with spectra of meteorite IOM. (a) and (c) Best fits in the 3.1 to 3.6 μm region between the OVIRS spectra (black) and the IOM spectra (red, solid), with noised added to simulate OVIRS noise (red, dashed); the spectra are normalized from 0 to 1 and offset for clarity. The shaded region indicates uncertainties, and vertical lines at 3.10, 3.275, 3.38, 3.42, and 3.50 μm indicate positions of possible absorption features. (b) and (d) OVIRS and IOM spectra from 2.1 to 3.6 μm shown without normalization or continuum removal; IOM spectra have been scaled.