yle("fill", "#69b3a2")
        .style("opacity", 0.3)

  // Show the median
  svg
    .selectAll("medianLines")
    .data(sumstat)
    .enter()
    .append("line")
      .attr("y1", function(d){return(y(d.key))})
      .attr("y2", function(d){return(y(d.key) + y.bandwidth()/2)})
      .attr("x1", function(d){return(x(d.value.median))})
      .attr("x2", function(d){return(x(d.value.median))})
      .attr("stroke", "black")
      .style("width", 80)

  // create a tooltip
  var tooltip = d3.select("#my_datav