Fig. 1From: Hybridization and introgression in sympatric and allopatric populations of four oak speciesPairwise FST in sympatric and allopatric populations of four oak species (a: the red box represents sympatric populations and the yellow box represents the same species). and principal coordinate analysis (PCoA) based on pairwise population FST values implemented in GENALEX 6.5 (b-d)Back to article page