We thank Hai Lin, Matthew Wheeler, and Eric Oliver for illuminating discussion and helping with analysis techniques, and Paul Roundy and an anonymous reviewer for helpful comments that helped to avoid making overstatements about the simple nature of the results. XZ’s visit at Dalhousie University is supported by the China Scholarship Council and Nanjing University. KRT acknowledges support from NSERC and the GOAPP research network funded by the Canadian Foundation for Climate and Atmospheric Sciences.
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