Highcharts.chart('container', {

    xAxis: {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
            'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
        breaks: [{
            from: 5.5,
            to: 7.5
        }],
        events: {
            afterBreaks: function () {
                if (
                    !this.brokenAxis ||
                    this.brokenAxis.breakArray.length === 0
                ) {
                    return;
                }

                var axis = this,
                    brokenAxis = axis.brokenAxis,
                    chart = axis.chart,
                    breakLine = brokenAxis.breakLine,
                    breakPoint = brokenAxis.breakArray[0],
                    pos = breakPoint.to,
                    path = axis.getPlotLinePath({
                        value: pos,
                        width: 2
                    });

                if (!breakLine) {
                    breakLine = brokenAxis.breakLine = chart.renderer.path(path)
                        .attr({
                            stroke: 'red',
                            'stroke-width': 1,
                            zIndex: 10,
                            translateX: axis.transB
                        }).add();
                } else {
                    breakLine.attr({
                        d: path,
                        translateX: axis.transB
                    });
                }
            }
        }
    },

    series: [{
        data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
    }]

});