Fig. 3

Wild-type worms change their orientation as they settle in solution whereas immobile worms do not. A Kernel (probability) density estimate (KDE) of wild-type swimmers’ orientation angle (θ) at positions 4 mm (N = 145), 12 mm (N = 141), 80 mm (N = 132), 140 mm (N = 122), and 200 mm (N = 124), beneath the liquid surface. B KDE of heat-shocked paralyzed WT animals at positions 4 mm (N = 121), 12 mm (N = 131), 80 mm (N = 129), 140 mm (N = 128), and 200 mm (N = 132) beneath the liquid surface. The figure was produced with the MATLAB^TM function “ksdensity” with “bandwidth” of π/12. The animals’ cartoons depict the average orientation of the animal with the animal’s color indicating the animal’s position beneath the liquid surface and the red dot indicating the animal’s head. Insets depict the concentration parameter λ on the left vertical axis (hollow circles) and the average orientation angle (± one standard deviation) on the right vertical axis (solid circles) as functions of the animal’s position beneath the surface. Additional data is provided in ESI Figs. S10 and S11