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Sequence of operations used for center of pressure (COP) trajectory decomposition. (A) Instant equilibrium points (IEPs) occur when the horizontal force component is zero (or very close to zero). (B) In the COP displacement data, the COP positions at the instants (IEPs) are located, and the spline interpolated rambling trajectory is shown. (C) Trembling trajectory, the difference between COP and interpolated rambling trajectories.
