Figure 4.

(a) Time series of height h of swimmers with different $\gamma$ values near a wall. Trajectories all begin with $h=3$ and $\theta =\pi /4$. In all cases, $\alpha =0.475\pi$. (b) Projections of trajectories in the plane of the wall. Trajectories all begin at $x=y=0$ and colours correspond to the same simulations as in (a).