Origins and destinations are represented by the circle’s segments. Each region/country is assigned a colour. Flows have the same colour as their origin and the width indicates their size. The direction of the flow is also shown by the gap between flow and country/region: small gap indicates origin; large gap indicates destination. Click on a segment to switch between country and region view.
Switch between time periods using Ctrl and number keys (1,2,3,4); reset the plot using Ctrl and r; zoom in/out with Ctrl and +/-