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Due to an error during production, some corrections were not made to the final version of the paper. In the Theoretical analysis section of page 4, lines 3 to 7 of the left column should read: where is the displacement from the equilibrium position before nonlinearities arise, i.e., is the critical amplitude, and is the root mean square (rms) of the temporal part of this critical motion .
In addition, there is an error in the label of the vertical axis in figure 6. The correct version is below.