Fig. 7

Illustration of two-parameter continuation used to find entrainment ranges as a function of the forcing strength. The dotted circles denote how the values of \(\delta=\omega_{\mathrm{f}}-\omega_{0}\) and \(\alpha_{\mathrm{f}}\) are updated at each continuation step. The plus signs denote points on the entrainment range that are detected by the continuation circles. This allows us to detect sharp corners that may be missed with standard continuation where we only look at vertical slices of parameter space