Fig. 4.

Brushing and linking on multiple visualizations. Three alternative views of samples: a geographical map indicating origins of samples (top), a scatter plot showing sample PCA coordinates (bottom left), and a neighbour-joining tree (bottom right). A lasso tool can be used to select points in any of the three plots, and the selected set of samples is automatically highlighted in all plots (black circles around points in bottom plots and black arcs in top plot correspond to the same set of selected samples)