Evidence of organics on Bennu in spectral features near 3.4 μm. (a) Average OVIRS spectrum of Bennu (red) and two OVIRS spectra of Bennu with spectral features near 3.4 μm. (b) Close-up of the continuum-removed region around 3.4 μm, offset, with wavelengths of C-H absorptions indicated by vertical gray lines. The top three spectra are the same as those shown in panel a. The shaded region indicates uncertainties, and the vertical lines at 3.10, 3.275, 3.38, 3.42, and 3.50 μm indicate positions of possible absorption features. (c) Laboratory spectra near 3.4 μm for comparison. Black lines are the spectra, and colors are spectra with noise added to simulate OVIRS noise. “CB” stands for “Cold Bokkeveld”, “bulk” refers to the whole meteorite, and “IOM” refers to the extracted insoluble organic component.