Fig. 4
From: Homogeneity and heterogeneity in near-infrared FTIR spectra of Ryugu returned samples
Effect of reflectance from sapphire dish. a Measurement areas on the aggregate sample, A9009. Grains and particles are fully occupied in the beam spot in position 1. Measurement spots were then shifted to the edge of the aggregate sample and void ratio increases from positon 2 to 4. Sapphire dish itself is measured in position 5. b Reflectance spectra of each measurement area increasing from positions 1 to 5. c Reflectance spectra normalized at 2.6 μm to compare the spectral profiles of positions 1 to 5. d Normalized reflectance spectra continuum with 2.6–3.2 μm, and e 3.3–3.6 μm show the change in absorption band depth from positions 1 to 5