{
const select_svg= d3.create("svg")
select_svg.attr("viewBox", [0 , 0, width, height]);
select_svg.selectAll('circle')
.data(data_arr)
.join('circle')
.attr('cx', d=> d.x)
.attr('cy', d=> d.y)
.attr('r', 9)
.attr("fill", "blue")
.attr("stroke", 2);
return select_svg.node();
}