10 Acknowledgments

RFS was supported by NASA grants NNG04GB92G and NAG 5-12450 and by NSF grants AST0205500 and AST0605738. ÅN is grateful to JILA and to the Danish Natural Science Research Council (FNU) for support during a one year sabbatical at the University of Colorado, Boulder. The authors’ simulations were performed on NASA’s project Columbia computer system, at the National Center for Supercomputing Applications, which is supported by the National Science Foundation, at Michigan State University and at the Danish Center for Scientific Computing, Copenhagen.

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