                xAxis: {
                    min: function (value) {
                        return null
                    },
                    max: function (value) {
                        return null;
                    }
                },
                yAxis: {},
                series: [{
                    name: 'no point',
                    type: 'line',
                    data: []
                }, {
                    name: 'one point',
                    type: 'line',
             