This research was supported by NSF Grants ATM 0340693 and ATM 0446509 at the University of Oklahoma. Reviews from two reviewers greatly helped the readability of this paper; Dr. Katharine M. Kanak is acknowledged for her reviews as well. We also are grateful to Drs. Dusan Zrnić, Alexander Ryzhkov, and Scott Giangrande for supplying data for our study.
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