Figure 6. Dependences of motion biases on the average swimming speed.

(a) Swimming speed bias with respect to the mean swimming speed. (b) Relative reversing rate bias with respect to the mean swimming speed. The horizontal error bars indicate the standard deviation of mean speeds for the trajectories grouped within a given speed interval (4–5, 5–6, 6–7, 7–8, 8–9, and ≥9 μm/s). The vertical error bars in (a) denote the standard deviation of the speed bias for the trajectories falling within the corresponding speed intervals. In both (a) and (b), each speed interval has over 80 sample trajectories measured.