We thank Steve Garner and Chris Kerr for helping us in the development of the ZETAC simulations and Larry Polinsky for his editorial corrections in an earlier version of the manuscript. Comments and suggestions provided by Geoff Vallis, Steven Feldstein, Sukyoung Lee, as well as anonymous reviewers, were greatly appreciated and made the manuscript much clearer. The AOS program of Princeton University that supported G. Rivière during this work is also sincerely acknowledged.
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