Maps of Geneland individual assignments to clusters for K = 4 (scale units in km). The three plots represent the assignment of pixels to each cluster: (a) Black Sea cluster; (b) Iberian cluster; and (c) North Atlantic cluster. The assignments of pixels to the fourth cluster are not shown, as no individuals are assigned to it ("ghost cluster", see text for further details). The highest membership values are in light yellow and the level curves illustrate the spatial changes in assignment values. The plot is based on the highest-probability run at that value of K.