Fig. 2
From: Characterization of prosthetic knees through a low-dimensional description of gait kinematics
Average elevation angles time course, with the corresponding 3-D representation (solid black: control, self-selected; dashed black: control, slow; blue: FB; red: FE; green: FM; shaded grey: CSS plane of covariance). Gait cycle has been normalized to 200 samples, with a fixed 80/20 ratio between double support phases and the interposed stance and swing. Elevation angles (left) are expressed in degrees and loop projections (right) are expressed in normalized arbitrary units