Panel A shows a sequence of images covering one cycle of oscillation of example A, a typical simulation of a doublet pair with doublet B straight and stationary. Images 0 and 10 should be identical. Association, propagation, and dissociation phases are indicated by the letters A, P, and D, respectively. Panel B shows a similar sequence for example B, in which doublet B has a fixed curvature of 0.05 rad μm−1. The parameters used for these models are given in Table 1. For example A, the time interval between images is 14.9 ms and the frequency is 6.7 s−1. For example B, the time interval between images is 9.8 ms and the frequency is 10.2 s−1.