Spatiotemporal maps of displacement phase for frequencies 50–400 Hz at first A-line from one animal. Phase wraps occur when there is a sharp transition from a dark red or black to white or yellow. (a) 50 Hz, (b) 100 Hz, (c) 150 Hz, (d) 200 Hz, (e) 250 Hz, (f) 300 Hz, (g) 350 Hz, (h) 400 Hz, (i) – (j) ECG trace for synchronization purposes.