      .attr("fill", d3.rgb(200, 200, 200))
 
   # axis on left
-  axis = svg.append("g")
+  LaxisData = [-1, -0.75, -0.5, -0.25, 0, 0.25, 0.5, 0.75, 1]
+  Laxis = svg.append("g")
 
   # axis: white lines
-  axis.append("g").selectAll("line.axis")
-     .data([-1, -0.75, -0.5, -0.25, 0, 0.25, 0.5, 0.75, 1])
+  Laxis.append("g").selectAll("empty")
+     .data(LaxisData)
      .enter()
      .append("line")
      .attr("class", "line")

     .attr("stroke-width", 2)
     .attr("fill", "none")


# load json file and call draw function
d3.json("hypo.json", draw)

  rightAxis = svg.append("g")

  for j in [0...nQuant]
    rightAxis.selectAll("empty")
       .data(data.qu)
       .enter()
       .append("text")
