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8 Acknowledgments

This work has been supported since the initial version in part by the National Science Foundation, Grant Numbers PHY 96-00049, 00-96522, and 03-53180, and by the National Aeronautics and Space Administration, Grant Number NAG5-10186. We also gratefully acknowledge the support of the Centre National de la Recherche Scientifique, and the hospitality of the Institut d’Astrophysique de Paris, where this update was completed. Comments from referees were particularly helpful in improving this update.


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