Movie 2.

Example of a high-TCS walking bout with the respective footfall pattern and visualization of PCs 1 and 3. Footfall pattern: black indicates swing phase, white indicates stance phase. Video view: tracked leg tips (round markers) with parts of their prospective movements for clarity. Open markers indicate swing phase, filled markers indicate stance phase. Note that the walking speed is similar to that in Movie M3. Movie M2 shows relatively high TCS values, resulting in a relatively flat shape of the time courses of PCs 1 and 3, with major amplitudes of oscillation in the direction of PC 1. The resulting elliptic shape can be cut in half horizontally to differentiate between the swing phases of the left (lower half) and right (upper half) tripod group, respectively.