如何更改highcharts中列之间的距离？

Highcharts.chart('container', {
    chart: {
        type: 'column'
    },
    plotOptions: {
        column: {
            pointPadding: 0.2, // 列之间的间隔为列宽的20%
            groupPadding: 0.1 // 列之间的间隔为列宽的10%
        }
    },
    series: [{
        name: 'Tokyo',
        data: [49.9, 71.5, 106.4, 129.2, 144.0]
    }, {
        name: 'New York',
        data: [83.6, 78.8, 98.5, 93.4, 106.0]
    }, {
        name: 'London',
        data: [48.9, 38.8, 39.3, 41.4, 47.0]
    }]
});