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Fig. 5. (A) Achilles tendon (AT) length and force measurements against time for
five consecutive hops. AT length is shown in the raw form (blue) and after
applying a fourth order, 5 Hz low-pass Butterworth filter (green). Note that
only periods of contact have been displayed and subsequent data during time
off the ground were removed. (B) Force against length for the same five trials
as in A. Arrows represent the general trend for rise and fall of the force
against length. (For an animation of stick figure, see Video 2 in
supplementary material)