chart = {
const svg = d3.create("svg")
.attr("viewBox", [0, 0, 975, 610]);
svg.append("g")
.attr("transform", "translate(610,20)")
.append(() => legend({color, title: data.title, width: 260}));
svg.append("g")
.selectAll("path")
.data(topojson.feature(us, us.objects.TZ).features)
.join("path")
.attr("fill", d => color(data.get(d.properties.Region_Cod.toString())))
.attr("d", path)
.append("title")
.text(d => `${d.properties.Region_Nam}, ${states.get(d.properties.Region_Cod).Region_Cod},
${format(data.get(d.properties.Region_Cod.toString()))}`);
svg.append("path")
.datum(topojson.mesh(us, us.objects.TZ, (a, b) => a == b))
.attr("fill", "none")
.attr("stroke", "white")
.attr("stroke-linejoin", "round")
.attr("d", path);
svg.append("path")
.datum(topojson.mesh(us, us.objects.TZ, (a, b) => a !== b))
.attr("fill", "none")
.attr("stroke", "white")
.attr("stroke-linejoin", "round")
.attr("d", path);
return svg.node();
}