Highcharts.chart('container', {

    chart: {
        type: 'bubble',
        plotBorderWidth: 1,
        zooming: {
            type: 'xy'
        }
    },

    title: {
        text: 'Highcharts with negative bubbles'
    },

    xAxis: {
        gridLineWidth: 1
    },

    yAxis: {
        startOnTick: false,
        endOnTick: false
    },

    series: [{
        data: [
            [9, 81, 13],
            [98, 5, 39],
            [51, 50, 23],
            [41, 22, -36],
            [58, 24, -30],
            [78, 37, -16],
            [55, 56, 3],
            [18, 45, 20],
            [42, 44, -22],
            [3, 52, 9],
            [31, 18, 47],
            [79, 91, 13],
            [93, 23, -27],
            [44, 83, -28]
        ],
        // displayNegative: true,
        negativeColor: Highcharts.getOptions().colors[1]
        // zThreshold: 0
    }]

});