amcharts Line with filled value ranges

HTML

<script src="http://www.amcharts.com/lib/amcharts.js" type="text/javascript"></script>
<div id="chartdiv" style="width: 100%; height: 362px;"></div>

JavaScript

var chart;
var chart2;

var chartData = [];
var chartData2 = [];

// generate some random data
function generateChartData() {
    var firstDate = new Date();
    firstDate.setDate(firstDate.getDate() - 10);

    for (var i = 0; i < 10; i++) {
        var newDate = new Date(firstDate);
        newDate.setDate(newDate.getDate() + i);

        var visits = Math.round(Math.random() * 40) ;
        var goods = Math.round(Math.random() * 20) ;
         var loves = Math.round(Math.random() * 30) ;

        chartData.push({
            date: newDate,
            visits: visits,
            goods:goods,
            loves:loves
        });
        
        var newDate2 = new Date(firstDate);
        newDate2.setDate(newDate2.getDate() + i);

        var visits = Math.round(Math.random() * 40) ;

        chartData2.push({
            date: newDate2,
            visits: visits
        });
        
    }
}

AmCharts.ready(function() {
    // generate some random data first   
    generateChartData();

    // SERIAL CHART
    chart = new AmCharts.AmSerialChart();
    chart.pathToImages = "http://www.amcharts.com/lib/images/";
    chart.marginLeft = 0;
    chart.marginRight = 0;
    chart.marginTop = 0;
    chart.autoMarginOffset = 5;
    chart.dataProvider = chartData;
    chart.categoryField = "date";

    // AXES
    // category
    var categoryAxis = chart.categoryAxis;
    categoryAxis.parseDates = true; // as our data is date-based, we set parseDates to true
    categoryAxis.minPeriod = "DD"; // our data is daily, so we set minPeriod to DD
    // value axis
    var valueAxis = new AmCharts.ValueAxis();
    valueAxis.inside = true;
    valueAxis.tickLength = 0;
    valueAxis.axisAlpha = 0;
    valueAxis.minimum = 0;
    valueAxis.maximum = 50;
    chart.addValueAxis(valueAxis);

    // GRAPH
    var graph = new AmCharts.AmGraph();
    graph.dashLength = 3;
    graph.lineColor = "#7717D7";
    graph.valueField = "visits";
    graph.dashLength = 3;
    graph.bullet =...