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These plots depict water velocities in the wake of a swimming squid. The colors represent the speed of the water (reds are high speed; blues, low), and the arrows show flow direction. The squid (arms shown in white) is swimming at 25 centimeters per second (1 foot per second). The long red streak of fast moving water is the column-like jet of the squid emitted from the nozzle under its arms. Water velocities in the jet approach 50 centimeters per second--twice as fast as the squid is swimming. [back]
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