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Fig. 4. Examples of stepping patterns. (A) Gap crossing, (B) undisturbed walking.
Grey bars, ground contacts of antennae; coloured bars, swing movements of
legs. FL, front leg (red); ML, middle leg (green); HL, hind leg (blue); l,
left; r, right; ac, first contact of the antennae with the second footbridge;
gc, gap-crossing step; te, tentative step; sh, short step. Normal walking
steps are not marked. In A, the defined sections of gap-crossing behaviour
(see Fig. 1) are separated by
vertical lines.