Axis Flags

HTML

<script src="http://code.highcharts.com/stock/highstock.js"></script>
<div id="container" style="height: 400px"></div>

JavaScript

$(function () {
    $('#container').highcharts({
        chart: {
            type: 'line', backgroundColor: '#FCFFC5'
        },
        credits: {
            enabled: false
        },
        legend: {
            enabled: false
        },
        xAxis: [{
            id: "1",
            categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
        },
        /* {
            id: "2",
            categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
        }*/
],
        plotOptions: {
            series: {
                allowPointSelect: true
            }
        },
        series: [{
            //xAxis:"1",
            data: [78.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 87.4]
        }, {
            type: 'flags',
            showInLegend: true,
            //xAxis:"2",
            data: [{
                x: 2
            }, {
                x: 8
            }],

            width: 1,
            height: 20,

            fillColor: 'white',
            lineWidth: 3,
            color: 'black',
            //lineColor: 'blue',
            style: {
                fontSize: '16px',
                fontWeight: 'normal',
                textAlign: 'center',
                color: 'red'
            }
        }]
    });



});