      .style("text-anchor", "middle")
      .attr("fill", titlecolor)
 
-  # maximum lod score
+  # overall maximum lod score
   maxlod = d3.max(data.peaks, (d) -> d.lod)
 
   # sort peaks to have increasing LOD score

             .domain([0, 25])
             .range([0, 1])

  # Using https://github.com/Caged/d3-tip
  #   [slightly modified in https://github.com/kbroman/d3-tip]
  eqtltip = d3.svg.tip()
                 .orient("right")

                 .domain(d3.range(4))
                 .rangePoints([left[2], right[2]], 1)

  # create SVG
  svg = d3.select("div#cistrans").append("svg")
          .attr("width", totalw)
          .attr("height", totalh)
