The comparison between the desired and actual gait trajectories of the two actuated joints during the validation experiments. The trajectories have been normalized to one gait cycle. The red lines are the predefined reference gait trajectory. The blue lines represent the average gait trajectories over the experimental period. The shaded area stands for the standard deviations of the average trajectories over the recorded gait cycles. Subplots (a, c, e, g) are the trajectories of the knee joint and subplots (b, d, f, h) are for the hip joint. The subplots in the top, second, third and bottom rows are for experiments with desired average antagonistic PM pressures 160, 240, 320 and 400 KPa respectively.