The authors thank Stephen Eckermann for providing the source code to GROGRAT, which was an extremely useful resource. AH’s work is supported by a National Science Foundation Graduate Research Fellowship and a National Defense Science and Engineering Graduate Fellowship. OB gratefully acknowledges financial support for this work under the National Science Foundation Grants OCE-0324934 and DMS-0604519. We are grateful for the comments of two anonymous referees that significantly improved an earlier version of this paper.
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