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Fig. 9. Follow-the-leader (FTL) foot placements. FTL deviation plotted for each of
the four pairs of legs (A). In each plot the origin was defined as the point
of anterior leg placement with positive axes pointed anteriorly and to the
right side of the animal. Points in quadrant I therefore represent a stance
position in front of and to the right of where the anterior leg had foot
placement. Flat terrain steps are in black, rough terrain in blue. In both
cases, footfalls were significantly skewed away from the origin, indicating
lack of FTL stepping. The distance of the deviations are represented as
histograms for flat (top) and rough (bottom) terrain running (B). Deviation
distance is the Euclidean distance to the origin for each point from the four
plots in A, pooled across all pairs of legs. The peaks of the distributions
are shifted from zero (perfect FTL stepping) and the means are above both the
strict (3 mm) and minimal (5 mm) FTL deviation criteria.
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