Fig. 5

Mean speed versus ϵ for a Gaussian threshold distribution. c̅ as a function of ϵ for \(h_{0}=0.3\). Solid curve: (24); circles: from averaging (21) over 1000 realisations per point. Equation (9) was truncated after 50 terms per sum. Other parameter values are \(\kappa=5\), \(\sigma^{2}=0.2\), \(L=100\)