Figure 5From: Ecological character displacement in the face of gene flow: Evidence from two species of nightingalesDistributions of PC3 residuals in allopatric and sympatric populations of nightingales. The graph shows distributions of PC3 residuals where the effects of latitude and longitude are controlled for. Boxes with the middle point represent median and 25% - 75% quartiles. The whiskers show non-outlier ranges.Back to article page