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Species trees A (top) and B (bottom) for the 2La region (fig. S27A and B in Fontaine et al. 2015), based on the assumed species trees xi and ix, respectively. The inversion orientations in the extant and ancestral species are given as “a”: fixed for the 2La orientation, “+”: fixed for the 2L+a orientation, and “a/+”: polymorphic for both orientations.
