Positions of transition points on doublet A, plotted as a function of time, for simulation examples A and B. The positions of association transitions, at the basal end of a separated region, are shown as open circles. The positions of dissociation points, at the distal end of a separated region, are shown as solid circles. The solid vertical lines demarcate the A, P, and D phases for one cycle of oscillation. These plots can be compared with Fig. 4 of Aoyama and Kamiya (1).