0.0001 0.01 1 100 k$_{c}$R$_{2}$$^{2}$/D$_{1}$ 0 0.5 1 1.5 2 2.5 3 D eff /D 1 R$_{1}$/R$_{2}$=10 R$_{1}$/R$_{2}$=100 0 5 10 15 20 0.8 1 1.2 1.4 1.6 Figure 5: Effective diffusion coefficient D$_{eff}$ of a chucker (normalised by the diffusion constant in the absence of chucking D$_{1}$ ) as a function of the dimensionless ratio k$_{c}$R 2 $_{2}$/D$_{1}$ , for R$_{1}$/R$_{2}$ = 10 (black circles) and R$_{1}$/R$_{2}$ = 100 (red squares). Note the logarithmic scale on the horizontal axis. The inset (on a linear scale) shows a comparison between the same data for small k$_{c}$ and the theoretical prediction, Eq.(7), with λ $_{=}$√$_{2}$$_{R}$$_{1}$$_{/}$$_{3}$ (green dashed line). 25