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Tucker trawl trajectory on the 2018-07-21 tow. The background is an "echogram" assembled by compiling the amplitude of echo returns from the ship ADCP. The rain drop-like features on the echogram are interference from other acoustic instruments operating at the same time. The white net trajectory here was obtained by a time-depth recorder that was attached to the net.  Credit: W. Lee, University of Washington, V18.