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. 2018 Jan 16;115(5):897–902. doi: 10.1073/pnas.1711254115

Fig. 4.

Fig. 4.

Generalization of the results of rate v, rate acceleration a, and rate jerk j as reported in Fig. 3. (Left) The picture illustrates the dynamics of the temporal evolution of a rate pulse, that is, the increase and decrease of the local rate in the central part of an etch pit. (Right) The side of this scheme illustrates the evolution of pulses during outward motion. While the lateral velocity of a single pulse (or ring) is constant, the vertical velocity decays. Subsequent pulses show an identical pattern.