geoGraticule();
        
        d3.select("svg").insert("path", "path.countries")
            .datum(graticule)
            .attr("class", "graticule line")
            .attr("d", geoPath);
        
        d3.select("svg").insert("path", "path.countries")
            .datum(graticule.outline)
            .attr("class", "graticule outline")
            .attr("d", geoPath);

        var zoomSettings = d3.zoomIdentity
          .translate(0, 0)
          .scale(200);

        var rotateScale = d3.scaleLinear