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εd and as a function of d (Eqs 15 and 16). For each preparation, the left panels show the data collected using the 2D external dynamical system, the right panels show the data collected using the 4D external dynamical system. The red plot in the upper panels show εd computed for surrogate trajectories obtained by randomizing phases of the original trajectories. The dotted line in the lower panels shows the threshold h used to assess the dynamical dimension d*.
