We are grateful to two anonymous reviewers for their comments, which helped us strengthen the manuscript presentation. This research was supported by the following grants: U.S. Department of Energy Grant DE-FG02-02ER63413, National Aeronautics and Space Administration Grant NNG-06-AG66G-1 (SK), and National Science Foundation Grants ATM-0324908, ATM-0351044, and ATM-0649512 (JTH, SBF, SL, SWS).
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