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Normalized angle signals of the prosthetic shank. The horizontal axis represents the gait cycle. One gait cycle is from heel strike to toe off and ends at the next heel strike of the prosthesis. The vertical axis denotes the shank angle of prosthesis relative to the vertical direction. The solid line shows the mean and the shaded area represents the standard deviation (SD) of the signal. The different colors represent different subjects (S1, S2, and S3), as shown in the legend.
