Ryugu IOM sample C0107-IOM residue_16-B. Zoom-in on the organic nanoparticles identified in situ in Fig. 7. (a) RGB image of the region including the organic nanoparticles (C=O at 1720 cm⁻¹ in red, C=C at 1600 cm⁻¹ in green, CH_X 1460 cm⁻¹ minus 1520 cm⁻¹ in blue). The white line shows the location of individual AFM-IR spectra taken across the organic nanoparticles. The colored dots (S₁ to S₅) correspond to average spectra taken on each side (S₁ and S₅ in blue) and on the organic nanoparticles (S₂ to S₄ in red), (b) Intensity ratios of frequencies corresponding to CH_X/C=C (1460/1600) and C=O/C=C (1700/1600) along the white line shown in (a). The location of the S₁ to S₅ spectra is recalled on the left axis, (c) Average AFM-IR spectra on each side (blue, S₁ and S₅) and on the organic nanoparticle (red, S₂ to S₄).