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Fig. 4. Angles of the knee joint, femur retraction, femur rotation and femur
depression versus time (as a percentage of stride cycle) for a single
stride for C. calyptratus (A) and D. dorsalis (B) moving on
a level treadmill. The arrows indicate the end of stance, and footfall occurs
at time 0%. The speeds for C. calyptratus and D. dorsalis
were approximately 17 cm s-1 and 50 cm s-1,
respectively.