Figure 4.

Analysis of trajectories with reversal events only (ϕ₁ = 180°). (A) Distribution of swimming speeds (average value for each run, red bars) fitted by a sum of two Gaussian distributions (solid line). The mean run speeds (μ_i) and standard deviations (σ_i) of the two fits are μ₁ = 19.4 μm s⁻¹, σ₁ = 8.7 μm s⁻¹; and μ₂ = 38.3 μm s⁻¹, σ₂ = 9.5 μm s⁻¹ (μ₂/μ₁ = 1.97), respectively. (B) Distribution of run times (green bars) with a mean run time of τ = 1.50 ± 0.07 s. Only runs between two reversal events are included. The exponential fit (dashed line) and the fit of a γ-distribution (solid line) are uniquely defined by the mean run time τ and contain no further fit parameter. To see this figure in color, go online.