ajax({
            url: "fixtures/test2.xgmml",
            dataType: "text",
            success: function(xml){
                options2.network = xml;
                vis2.draw(options2);
            },
            error: function(){
                alert("Error loading file 2");
            }
        });

        var options3 = {
                panZoomControlVisible: true,
                edgesMerged: false,
                nodeLabelsVisible: true,
                nodeTooltipsEnabled: false,
          