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Fig. 4. Summary of COM mechanics during C, U and V treatments (A,B,C, respectively). Silhouettes of the bird with corresponding limb stick figures at three points during the perturbed step: toe-down, midstance, and toe-off. The broken silhouette and stick figure represent the time of tissue paper contact in the U treatment. The COM path is overlaid for the time interval illustrated in Fig. 3B, along with the corresponding net change in height ({Delta}sv, blue), GRF impulse vector (J, red, summed over the stance phase), and initial and final velocity vectors (Vi and Vf, respectively, green) to illustrate differences among treatments.





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