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Measured diffusion coefficient as a function of height for motion in the normal direction. Temperature is assumed to be room temperature (22 °C). Fitted particle radius is (1.26 ± 0.02) μm. Top Left Inset shows raw scattered intensity data (blue) and its moving average (red), showing 50-nm piezo steps. Bottom Right Inset shows example autocorrelation function (black circles) and linear fit (red line) in the intermediate time (diffusive) regime.
