We thank FairfieldNodal for providing the field data used in this study. We thank Alexander Klokov, Karl Schleicher, Parvaneh Karimi, Araz Mahdad, Josef Paffenholz, David Hays, Paul Docherty and Le-wei Mo for helpful discussions. We also thank Sam Kaplan, Chengbo Li, Jinkun Cheng, Jeff Shragge, Evert Slob, and one anonymous reviewer for their constructive suggestions, which helped improve this paper.
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