Fig. 4.

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Comparison between highest Lyapunov exponent and frequency drift. The red points show the chaotic orbits identified with the visual classification (see Sect. 4.2.2) while the red shaded area indicates the zone containing only chaotic orbits according to the frequency drift method (see Sect. 3.3.2). Only orbits with a highest Lyapunov exponent greater than 0 are shown in this diagram.
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