Fig. 2: ABBA-BABA analysis of introgression in the AA-genome species.

a, Plot of z scores for the D statistic for each chromosome. Values above 3.0 are highly significant. Each z score is signed, with positive values indicating that the introgression involved the pair of species on the species tree in b indicated by the dashed arrow. b, Subtree restricted to four species from the AA-genome clade.