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Illustration of the effect of FCSI values on feature separability. Three upper limb movements (wrist flexion, wrist supination, and fine pinch) in the 18-th channel from Subject 3 are used as an example to produce the scatter plots. The three-dimensional coordinate axes stand for feature values. (A) Three features with the lowest FCSI values; (B) three features with the highest FCSI values; and (C) three TD features (WL, ZC, and SSC) used for comparison.
