   yScaleImg = []
   zScaleImg = []
   for i in [0...data.nll.length]
+    d3.select("div#heatmap_fig")
+      .append("hr")
+      .style("border", 0)
+      .style("width", "100%")
+      .style("color", "black")
+      .style("background-color", "black")
+      .style("height", "2px")
     d3.select("div#heatmap_fig")
       .append("h3")
       .text("Chromosome #{i+1}")

                       d3.select("rect#mouseover1").remove())
                      

    panels[i][1].append("g").attr("id", "n_imgrect_#{i}")
             .selectAll("empty")
             .data(llList[i])

                  .range([darkBlue, "white"])
                  .clamp(true)

    # title text
    for j in [0..1]
      panels[i][j].append("text").attr("id", "loglik#{i}#{j}")
               .text("")
               .attr("x", w/2)
               .attr("y", -pad.top*0.25)
               .attr("text-anchor", "middle")
               .attr("dominant-baseline", "middle")
               .attr("fill", labelcolor)
      panels[i][j].append("text")
               .text(["Nicola", "Karl"][j])
               .attr("x", w/2)
               .attr("y", -pad.top*0.75)
               .attr("text-anchor", "middle")
               .attr("dominant-baseline", "middle")
               .attr("fill", maincolor)

    # left image panel
    panels[i][0].append("g").attr("id", "n_imgrect_#{i}")
             .selectAll("empty")
             .data(llList[i])
