   .y(function(d) { return y(d.y); })
    .size([width, (height-margin.bottom)])
    .bandwidth(20)    // smaller = more precision in lines = more lines
    (dataVST)

  // Add the contour: several "path"
  svgVST.append("g")
    .selectAll("path")
    .data(densityData)
    .enter()
    .append("path")
      .attr("d", d3.geoPath())
      .attr("fill", "none")
      .attr("stroke", "#D3D3D3")
      .attr("stroke-linejoin", "round")
	  
	  
	 	svgVST.append("rect").attr('class', 'rect1').attr("x", 0)
      