Fig. 13

Time courses of θ for optimal values of β found for $P=10.5$ and various A values as labeled. Note that $\theta (10.5)$ increases by slightly more than 2π as A increases from 4.5, with $\theta (4.5)\approx 5.052$, to 10.5, with $\theta (10.5)\approx 11.771$, and from 10.5 to 16.5, with $\theta (16.5)\approx 18.123$, corresponding to the abrupt jumps in Figure 12.