I’m using jqPlot to make a simple graph:

Their documentation states that it’s very out of date. Is there a way to shade the lower half of the graph (below the line) with a color such as this one?
http://www.epmag.com/resources/images/archives/OFFPROD-Petrolite-Graph1.jpg
If not, any clues on how I could shade it myself? jqPlot uses javascript to draw on an HTML canvas.
In your series options set:
See this example.