The authors thank Luc Rainville, Jon Pompa, Achintya Madduri, Jody Klymak, Jennifer MacKinnon, Andrew Lucas, and Melissa Omand for assistance with the development and operation of the Wirewalker. The Imperial Beach data were graciously provided by M. Omand and R. Guza. Support for Wirewalker development was provided by Grants NSF OCE05-01783 and ONR N00014-08-1-1022.
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