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Fig. 3. Representative changes in (A) knee, (B) ankle and (C) metatarsophalangeal (MP) joint angles versus time for three strides of wallaby #1 while hopping at 4.2 m s-1 on the level and on an incline. Because of small shifts in relative stance time for level versus incline hopping at the same speed, the graphs have been normalized to the same equivalent time period (time base shown is the average for the two conditions).