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Fig. 3. On the level, peak vertical force Fz,peak under the
forelimb increased as a function of speed but the forces under the hindlimb
remained constant at all trotting speeds (A). On an incline (B), force
increased with speed in both limbs but was lower in the forelimb than on the
level. The bottom figure shows the incline condition with the regression lines
from the level condition. Symbols and lines are explained in the legend to
Fig. 2.