          max: function (value) {
                        return value.max + 20 * 24 * 3600 * 1000;
                    }
                },
                yAxis: {},
                series: [{
                    name: 'one point',
                    type: 'line',
                    data: [
                        [new Date('2012-9-12'), 11]
                    ]
                }, {
                    name: 'two points',
                    type: 'line',
                    data: [
                   