Fig. 1
From: Is there a trade-off between economy and task goal variability in transfemoral amputee gait?
A Schematic depicting the goal equivalent manifold (GEM) for maintaining constant walking speed (v) using data from TF01. The red dot is the preferred mean operating point. Each blue dot represents the combination of stride time and stride length for an amputee participant with walking speed at 1.2 m/s. Dots that lie exactly on the red diagonal line (GEM) achieved the same speed and satisfied the goal. B The time series of δT and δp deviations for the data set shown in A