 node names.
  // So I have to do a link between this id and the name
  var idToNode = {};
  data.nodes.forEach(function (n) {
    idToNode[n.id] = n;
  });

  // Add the links
  var links = svg
    .selectAll('mylinks')
    .data(data.links)
    .enter()
    .append('path')
    .attr('d', function (d) {
      start = x(idToNode[d.source].name)    // X position of start node on the X axis
      end = x(idToNode[d.target].name)      // X position of end node
      return ['M', start, height-30,    // the arc