tooltip();
    tooltip.duration(0);

    d3.select('.tooltip_me')
        .on('mouseover', function(d,i) {
            console.log("mouseover", d, i);
            var data = {series: {
                key: "title",
                value: "the value",
                color: "#229922"
            }};
            tooltip.data(data).hidden(false);
        })
        .on('mouseout', function(d,i) {
            console.log("mouseout", d, i);
            tooltip.hidden(true);
        })
        .on('mousemove', fu