                 .attr("r", 6)
                 .attr("fill", purple)
                 .attr("stroke", "none")
+                .attr("stroke-width", "2")
                 .attr("opacity", 0)
                 .on("mouseover", (td) ->
                        d3.select(this).attr("opacity", 1))

        .attr("r", 6)
        .attr("fill", purple)
        .attr("stroke", "none")
        .attr("opacity", 0)
        .on("mouseover", ->
               d3.select(this).attr("opacity", 1))

        .on("click", (td) ->
               console.log(td)
               markerClick[lastMarker] = 0
               d3.select("#circle#{lastMarker}").attr("opacity", 0).attr("fill",purple).attr("stroke","none")
               lastMarker = td
               markerClick[td] = 1
               d3.select(this).attr("opacity", 1).attr("fill",pink).attr("stroke",purple))

  # select of chromosome for lower LOD detailed curve
  lastChr = randomChr
