A Bar chart with a trendline

In this chart the trendline is provided by the Line chart - which uses the same data as the Bar chart, but its color is set to transparent so you can't see it. The Bar chart can also draw a trendline by itself.

[No canvas support]

This goes in the documents header: 
<script src="RGraph.common.core.js"></script>
<script src="RGraph.common.dynamic.js"></script>
<script src="RGraph.common.tooltips.js"></script>
<script src="RGraph.bar.js"></script>
Put this where you want the chart to show up: 
<div>
    <canvas id="cvs" width="750" height="250">[No canvas support]</canvas>
</div>
This is the code that generates the chart - it should be placed AFTER the canvas tag(s):