Residual fit of Berthelot’s pipit across 13 island populations in tree-based model of divergence without gene flow from Genomic variation, population history and within-archipelago adaptation between island bird populations

Figure S4. Evolutionary TreeMix model fit to Berthelot’s pipit populations, with no migration edges, using windows of 50 SNPs. Population pairs with positive residuals (navy) were taken to be genetically more closely related than represented in the best fit tree and are candidates for admixture, while negative residuals (yellow-red) suggest population pairs too closely represented by the tree.