<html> <head> <link href="../css/c3.css" rel="stylesheet" type="text/css"> </head> <body> <div id="chart"></div> <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script> <script src="../js/c3.js"></script> <script> var chart = c3.generate({ data: { columns: [ ['data1', 30, 200, 100, 400, 150, 250], ['data2', 130, 100, 140, 200, 150, 50] ], types: { data1: 'spline', data2: 'spline' } }, spline: { interpolation: { type: 'monotone', // 'cardinal' is default }, }, }); </script> </body> </html>