A Flow map can be used to display any type of movement, for example people in migration, goods through trade, and the spread of disease. This particular Flow map displays the traffic of telecommunications in certain countries of Europe. The scale in this type of map is very interesting, the thickness of the line from country to country is relative to the millions of minutes used during telecommunication between those places. The white circles represent the total annual outgoing traffic to other countries. info from:
http://mundi.net/maps/maps_014/
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