The author thanks Eric Slater, Lloyd Green, Mike Goldin, Chris Neely, and Chris Halle of the Marine Physical Laboratory of Scripps Institution of Oceanography for assistance in the design, construction, and operation of the sonars used in SHEBA. Andreas Heiberg, John Bitters, Deane Stewart, and Roger Anderson of the University of Washington provided critical assistance with the ice-camp operations, as did Jay Ardai of Lamont-Doherty Geophysical Observatory. This work was supported by the National Science Foundation.
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