Figure 3

Short time evolution of variance 〈Δx ²(t)〉 and the mean particle position 〈x(t)〉. The initial positions of particle trajectories 〈x(0)〉 were equally placed at 0.5, 0.4, …, −0.5 μm (from bottom to top). (a) Short time evolution of variance 〈Δx ²(t)〉. Thick curves show experimental data (vertically displaced with respect to each other, offset 0.15 × 〈x(0)〉) and thin dotted curves correspond to equation (5) fitted to experimental data with the only fitting parameter γ _c (see Methods). Inset shows γ _c obtained this way for initial particle position. (b) Short time evolution of the mean particle displacement from the starting location 〈x(0)〉. Thick curves show experimental data and thin lines are obtained using equation (4) with already obtained values of γ and κ.