score:16

Accepted answer

The parameter we were looking for is named negativeColor. Use it in an area serie like this :

   series: [{
        type:'area',
        data:chartValues,
        color: "#FF0000",
        threshold: 0,
        negativeColor: '#00FFFF',

        marker : {
            enabled: true
        }
    }]

see the result in this JSFiddle.


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