score:1

Accepted answer

You can use breaks:

    xAxis: {
        breaks: [{
            from: 3,
            to: 9,
            breakSize: 1
        }]
    }

Live example: http://jsfiddle.net/BlackLabel/xr9j7ybc/

API Reference: https://api.highcharts.com/highcharts/xAxis.breaks


Or oridinal property from Highstock:

    xAxis: {
        type: 'datetime',
        ordinal: true
    }

Live example: http://jsfiddle.net/BlackLabel/x0Ljh19v/

API Reference: https://api.highcharts.com/highstock/xAxis.ordinal


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