  // What is the list of groups?
  allKeys = sumstat.map(function(d){return d.key})

  // Add an svg element for each group. The will be one beside each other and will go on the next row when no more room available
  var svg = d3.select("#my_dataviz")
    .selectAll("uniqueChart")
    .data(sumstat)
    .enter()
    .append("svg")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
    .append("g")
      .attr("transform",
            "translat