   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}")


  # dimensions
  w = 300 # width of heat maps
  pad = {left:60, top:25, right:25, bottom: 35, inner: 0}
  h = w # height of heat maps
  h2 = (h - pad.top - pad.bottom)/2 # height of line plot


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

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