We gratefully appreciate the help and comments from Stacy Brodzik, Shuyi Chen, Deanna Hence, Bradley Smull, and Jian Yuan. Beth Tully assisted with graphics and editing. Finally, we thank Michael Bell for graciously providing the dataset used in this study. This research was supported by the National Science Foundation under Grants ATM-0432623 and ATM-0743180, and the Department of Defense through the National Defense Science and Engineering Graduate Fellowship Program.
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