Fig. 6. Polar plots of substrate reaction force vectors in the frontal plane. Each arrow represents an individual reaction force with the arrow length representing its magnitude in body weight (BW) units, and arrow orientation its deviation from vertical. SRF vectors leaning medially have negative angles, those leaning laterally have positive angles. E. patas forelimb (A), L. catta forelimb (B), E. patas hindlimb (C), L. catta hindlimb (D).