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How estimates respond to various modifications of the base model. Key: base, model in Fig. 1A; DtoX, gene flow from Denisovans into Africans; HtoD, gene flow from hyperarchaics into Denisovans; NtoD, gene flow from Neanderthals to Denisovans; XYtoN, gene flow from early moderns into Neanderthals. All estimates are based on the YRI.CEU dataset.
