How to make this graph in R

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Do you know what this kind of graph is called, and how can I make it in R?

Thanks-

enter image description here

Source of the image: http://www.wired.com/2014/05/alumni-network-2/

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Nikos On BEST ANSWER

this chart is called a 'Sankey diagram'. I don't really know how to do in R but I am using d3 to create this at work. An example here: http://bost.ocks.org/mike/sankey/