javascript - Get node position in D3 sankey diagram -

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i'm using d3 plug-in make sankey diagram, , add labels above each column of nodes. this:enter image description here

is there function in sankey object can return location of nodes?

var sankey = d3.sankey()     .nodewidth(15)     .nodepadding(10)     .size([width, height]);

i'm following pattern here: http://bost.ocks.org/mike/sankey/


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