Fig. S3.

Quantification of front propagation in model. (A) Comparison of maximal flow velocity and front velocity over the course of the initial 15 periods after a concentration stimulus in the center for a tube. (B) Comparison of observed front diffusivity calculated from the variance of the time-averaged concentration over time, $\mathrm{var}(⟨c⟩)/2t$, the absolute value of the effective Taylor diffusivity according to Eq. 7 averaged over the area within the two fronts spreading right and left of stimulation site, and the molecular diffusivity.