]).range([(height-margin.bottom),0]);
	

		   // Add points
  svgVST.append("g")
    .selectAll("circle")
    .data(dataVST)
    .enter()
    .append("circle")
      .attr("r", 5)
      .attr("fill", function(d){ return (d.c_ == 1)?"#1f78b4":"#a6cee3";})
      .attr("cx", function(d){ return x(d.x);})
      .attr("cy", function(d){return y(d.y);}).attr("stroke","#F5F5F5")
	  
	  
		  	  

densityData = d3.contourDensity()
    .x(function(d) { return x(d.x); })   // x and y = column name in .csv input data
 