请教下Fusioncharts里的折线图，如何在同一个图里画两根折现

请问下Fusioncharts里的折线图，怎么在同一个图里画两根折现
请问下Fusioncharts里的折线图，怎么在同一个图里画两根折现

$chart=new FusionCharts("Line","400","300");
$chart->setSWFPath("./Charts/");
$chart->addChartData($count1,"label=1");
$chart->addChartData($count2,"label=2");
$chart->addChartData($count3,"label=3");
$chart->addChartData($count4,"label=4");
$chart->renderChart();