score:2

Accepted answer

If you need to stack, you should have the common x values like in the example

http://jsfiddle.net/DXHDT/

So in your case it can be something like:

 var series = [{
    data: [[85, 0], [155, 220],[265, 220]],
    lineColor: "#E8D0D0",
    fillColor: "#E8D0D0",
    showLegend: false
}, {
    data: [[115, 0], [215, 220],[265, 220]],
    lineColor: "#D1A1A1",
    showLegend: false,
    fillColor: "#D1A1A1"
}, {
    data: [[145, 0], [265, 220]],
    showLegend: false,
    lineColor: "#BB8977",
    fillColor: "#BB8977"
}];

http://jsfiddle.net/43xEW/3/


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