FIG. 2:

An example of autocorrelation functions from simulation (for $q=0.515\mu {\text{m}}^{-1}$). Solid lines are averaged over three runs and dashed lines are for a single run. The shaded region is the standard deviation of the average. Here $\kappa =33.8k_{\text{B}}T$ and $D=8\mu {\text{m}}^2/\text{s}$.