<html> <head> <link rel="stylesheet" type="text/css" href="/css/c3.css"> </head> <body> <div id="chart"></div> <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> <script src="/js/c3.min.js"></script> <script> var chart = c3.generate({ bindto: '#chart', data: { columns: [ ['data1', 30, 200, 100, 400, 150, 250], ['data2', 130, 300, 200, 600, 250, 150] ], }, point: { // r: 10 r: function (d) { return d.id === 'data2' ? 10 : 2.5; } } }); </script> </body> </html>