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8 Acknowledgements

I would like to acknowledge the kind hospitality of the Aspen Center for Physics, and the anonymous referees whose extensive knowledge of the subject has helped fill in the gaps in my understanding. Extensive use was made of both the arXiv pre-print server and the ADS system. This work has been supported by NASA EPSCoR grant NCCW-0058, Montana EPSCoR grant NCC5-240, NASA Cooperative Agreement NCC5-579, and NASA APRA grant NNG04GD52G.


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