Fig. 4.

(a) Average phase drift per beat between end oscillators (measured in beats) as a function of height above the wall and radial spring stiffness. Shown also are four representative kymographs. (b) Time-averaged amplitude Ā and (c) angle $\left|\overline{\Psi }\right|$ of the complex order parameter Z = Ae^iΨ. The axes are the same as in (a). (d) Same as (a) but with hydrodynamic interactions truncated to nearest neighbor. Parameters used include a = 1.74 μm, ℓ = 9.19 μm, R = 1.59 μm, and viscosity μ = 6 mPas. Simulations correspond to 0 ≤ t ≤ 2000 s. The dashed white line shows the value of λ corresponding to Fig. 2. Note the different color scales used throughout.