Chartjs-How to remove minuses in a tornado/bar chart

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options.scales.xAxes.ticks has a callback that can be used to manipulate the value as it should be displayed.

Docs:
http://www.chartjs.org/docs/latest/axes/styling.html#tick-configuration

options: {
    scales: {
        xAxes: [{
            ticks: {
                callback: value => value.toString().replace('-', '')
            }
        }]
    }
}

Working example:
https://jsfiddle.net/Lkea8z2q/11/

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