Scatterplot of pairwise geographic vs. genetic distances of the 11 Western Mediterranean samples. The white dots correspond to pairs of populations from the same side of the Mediterranean (i.e. NW Africa vs. NW Africa and SW Europe vs. SW Europe), while the black dots correspond to NW Africa vs. SW Europe pairs of populations. The plot reveals different distributions for the two datasets, also reflected in the respective least squares regression lines (dashed for the same-coast and dotted for the opposite-coast pairs of populations). The continuous black line represents the overall correlation.
Athanasiadis et al. BMC Evolutionary Biology 2010 10:84 doi:10.1186/1471-2148-10-84