Figure 5.

Distributions 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.

Reifová et al. BMC Evolutionary Biology 2011 11:138   doi:10.1186/1471-2148-11-138
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