Fig. 7. Box and whisker plots of duration (A), body advance (B) and body velocity (C) of sections of the gap-crossing sequences (note the different scales for body velocity and duration). Red, IFM and IMH; black, EFL, ML, HL (see Fig. 1 for abbreviations); arithmetic means are added as squares. Left, 30 mm trials (N=7 animals, n=15 trials); right, 50 mm trials (N=5 animals, n=10 trials); mean walking velocity (30.0±3.4 mm s^–1) calculated from ten sequences of undisturbed walking is added as a horizontal broken line in B. Negative duration values of interval sections indicate overlapping of gap-crossing steps of neighbouring leg pairs (30 mm: 5 cases in IFM, 5 cases IMH; 50 mm: 4 cases in IMH).