jQuery Sparkline Barchart Thresholds

HTML

<script src="http://omnipotent.net/jquery.sparkline/2.1/jquery.sparkline.js"></script>
<p>
Sparkline appears here: <span id="sparkline">&nbsp;</span>
</p>

JavaScript

// jsfiddle configured to load jQuery Sparkline 2.1
// http://omnipotent.net/jquery.sparkline/

// Values to render
var values = [1,2,3,4,5,7,3,9];

// Draw a sparkline for the #sparkline element
$('#sparkline').sparkline(values, {
    type: "bar",
    colorMap: { ":3": "blue", "4:": "red" },
});