Figure 9.

Tracking of C. reinhardtii. (a) Probability $P\left(N_c,\langle \left|\theta \right|\rangle \right)$ of all tracks ($\Delta t=0.05$ s). Tracks within the (red, lower right) bordered region (example in top-right inset, 7 s, scale bar = $150\mu$m) are used to measure $P\left(v\right)$; top-left inset: an excluded track with $N_c<0.4$, 30 s, scale bar = $30\mu$m). (b) Normalized $P\left(v\right)$ from tracks selected in panel a, for two values of τ. Dashed line: $P\left(v\right)$ from DDM analysis.