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Fig. 2. (A) Data collection setup, illustrating how forelimb force data were
collected (first contact with force platform). In this diagram, the opossum is
moving up the incline, and a single forelimb has stepped onto the force plate.
(B,C) Digitized landmarks and the calculation of overall limb excursion
angles. Protraction angle was measured at touchdown, retraction angle was
measured at lift-off, and mediolateral angles were measured at both
events.