Extended Data Fig. 1: Comparing high- and low-resolution OVIRS spectra of site 6.

a, The lower-resolution spectrum (magenta) of site 6 shown in the main-text as compared to three higher-resolution pyroxene spectra obtained of site 6 (teal) during a lower altitude (~1.4 km) regional flyby of Bennu by the OSIRIS-REx spacecraft. The lower-resolution spectrum (magenta) has been ratioed by Bennu’s global average spectrum to bring out the subtle pyroxene absorption features near 1 and 2 μm, whereas the high-resolution spectra do not require any ratioing to observe these absorption features. b, The band I and II centers (1 and 2 μm) calculated for the pyroxene absorption features plotted against each other, for the lower-resolution (ratioed, magenta) and higher-resolution (unratioed, teal) spectra of site 6. The spectral ratioing does not affect the band centers obtained beyond the uncertainty assigned by the fitting procedure. c, HCP% versus the ratio of the LCP to the HCP band strengths for the lower-resolution (ratioed, magenta) and higher-resolution (unratioed, teal) spectra of site 6, which again shows that the ratioing procedure does not affect the results obtained by applying the MGM to these spectra.