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Comparison between internally and surface-labeled spheres of the same radius. Autocorrelation curves of internally labeled (cross) and surface-labeled (square) spheres both with radius 
are measured. The fitting result of internally labeled spheres is given in Fig. 3. For surface-labeled spheres, the fit to a shell model returns a radius of 
and τd = 77 ± 1 ms, which agrees well with the theoretically expected values.
