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Fig. 3. (A) Representative forelimb (left) and hindlimb (right) ground reaction forces in A. mississippiensis (trials 2C26 and 2C29; 0.202 m s-1 and 0.198 m s-1, respectively). Negative and positive values in the craniocaudal forces are reflective of braking and propulsive efforts, respectively. Positive mediolateral forces reflect lateral pushes by the limbs. Data are unfiltered in order to preserve the impact spike on the hindlimb record. Abbreviations: Fx, mediolateral forces; Fy, craniocaudal forces; Fz, vertical forces. Plots of (B) peak vertical force and (C) net craniocaudal impulse against speed. Symbols: open square, forelimb; filled square, hindlimb.





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