t: " + d.port + "<br>Organization: " + d.org + "<br>City: " + d.city + "<br>Country: " + d.country);}
                })
                .on('mouseover.fade', fade(0.1))
                .on("mouseout.tooltip", function() {
                tooltip.transition()
                .duration(100)
                .style("opacity", 0);
                })
                .on('mouseout.fade', fade(1))
                // on mousemove, when the user is mousing over, it will change the position of the tooltip
           