Fig. 8. Histograms of muscle activity duration, onset of muscle activity relative to the red axial myomere and electromyographic (EMG) burst intensity for seven intrinsic tail muscles during kick-and-glide accelerations (red), braking (white), backing maneuver (green) and normal swimming at 1.2 L s^–1 (black) (Flammang and Lauder, 2008). The left-hand y-axis is scaled for both muscle activity duration and the relative onset of muscle activity (in seconds), and the right-hand y-axis represents the EMG burst intensity (in mV s). Error bars indicate s.e.m. The red axial onset of activity was the reference for other muscle relative onsets.