The sonar systems were designed, constructed, and deployed by Eric Slater, Lloyd Green, Mike Goldin, and Chris Neely at the Marine Physical Laboratory of Scripps Institution of Oceanography. The author thanks Jay Ardai, John Bitters, Andreas Heiberg, Dean Stewart, Roger Anderson, and the crew of the CCG des Groseilliers for their support during SHEBA. Comments of the two reviewers were greatly appreciated. This work was supported by the National Science Foundation.
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