Fig. 6. Histograms of muscle activity duration (A), onset of muscle activity relative to lateral red muscle onset (B), and EMG burst intensity (C) of intrinsic caudal muscles on the right side at 0.5 (black bars), 1.2 (red bars), and 2.0 L s^–1 (green bars). Error bars indicate standard error of the mean. Muscle activity is shown for the red myomere (RED), hypochordal longitudinalis (HL), flexor dorsalis (FD), flexor ventralis (FV), supracarinalis (SC), infracarinalis (IC), interradialis (IR) designated by the number of the dorsally corresponding fin ray, and lateralis superficialis (LS). Some muscles were not active at 0.5 L s^–1 (e.g. FV) and therefore a gap is present instead of a black bar.