Edit in JSFiddle

g = new Dygraph(document.getElementById("graph"),
                 "X,R,S,T\n" +
                 "1,0,3,18\n" +
                 "2,2,6,16\n" +
                 "3,4,8,14\n" +
                 "4,6,9,12\n" +
                 "5,8,9,13\n" +
                 "6,10,8,14\n" +
                 "7,12,6,15\n" +
                 "8,14,3,16\n",
                 {
                     legend: 'always',
                     animatedZooms: true,
                     title: 'Dygraphs multi-axis demo',
                     T : {
                       axis : { }
                     }
                 });

<!-- You may set style: "width: ...; height: ..." to size the chart -->
<div id="graph"></div>
/*
Relevant CSS classes include:

Labels on the X & Y axes:
.dygraph-axis-label
.dygraph-axis-label-x
.dygraph-axis-label-y
.dygraph-axis-label-y2

Chart labels, see http://dygraphs.com/tests/styled-chart-labels.html
.dygraph-title
.dygraph-xlabel
.dygraph-ylabel
.dygraph-y2label

The legend, see http://dygraphs.com/tests/series-highlight.html
.dygraph-legend
*/
.dygraph-title {
    color: gray;
}