We thank Ricardo Matano, Roger Samelson, Michael Schlax, Deborah Smith, and Rob Wood for helpful discussions during the course of this analysis. We also thank Holda Biskeborn for help in editing this manuscript. We thank two anonymous reviewers for their thorough reading and helpful comments on our paper that lead to improved discussion of several points in the manuscript. The research presented here was supported by NASA Grants NAS5-32965 and NAG5-12378.
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