tokens: C.F.G.’s work was supported, in part, by a Romano Professorial Scholar appointment, a Simons Fellowship in Theoretical Physics, and a Visiting Fellowship at All Souls College, Oxford. We thank S. Desch, C. Thompson, M. Chandra, B. Ryan, J. Papaloizou, and C. Terquem for comments, and the referee, S. Charnoz, for a thoughtful report that greatly improved the manuscript.
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