A Scatter chart using the horizontalLines feature to show an average

[No canvas support]

This goes in the documents header:
<script src="RGraph.common.core.js"></script>
<script src="RGraph.scatter.js"></script>
Put this where you want the chart to show up:
<canvas id="cvs" width="750" height="350">
    [No canvas support]
</canvas>
This is the code that generates the chart - it should be placed AFTER the canvas tag(s):