Figure 5

Numerically calculated regularization regions according to the waveform complexity (number of spikes or local maxima per period) of their solutions and chaotic regions (black) in the φ − η control plane for four values of the shape parameter: (a) m = 0, (b) \(m=0.717\simeq \,{m}_{max}^{impulse}\) (i.e., the m value at which the SE’s impulse is maximum), (c) m = 0.9, and (d) m = 0.95. Fixed parameters: \(\delta =\mathrm{0.25,}\,\gamma =\mathrm{0.29,}\,\beta =\mathrm{1,}\,\omega =1\).