1. Applied Research Laboratories, The University of Texas at Austin, Austin, Texas 78713, USA
2. University of Delaware, Newark, Delaware 19716, USA
3. Naval Postgraduate School, Monterey, California 93943, USA
4. U.S. Naval Research Laboratory, Washington, D.C. 20375, USA
5. Defence Research and Development Canada, Dartmouth, Nova Scotia, Canada
6. Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA
7. Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093, USA