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

                .attr("r", 6)
                .attr("fill", purple)
                .attr("stroke", "none")
                .attr("opacity", 0)
                .on("mouseover", (td) ->
                       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
