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Center of pressure (CoP) trajectory (in black) and 95th percentile ellipse (in blue) within the 2.5 s time window (A). First peak (FP) and maximal oscillation (ΔCoPMax) referred to the anterior-posterior CoP trajectory (B); the grey dotted line marks the perturbation point (PP), and the green dotted line marks the mean value of the CoP trajectory before the PP.
