zation
  var container = document.getElementById('visualization');
  var options = {
    format: {
      minorLabels: function(date, scale, step) {
        var now = new Date();
        var ago = now - date;
        var divider;
        switch (scale) {
          case 'millisecond':
            divider = 1;
            break;
          case 'second':
            divider = 1000;
            break;
          case 'minute':
            divider = 1000 * 60;
            break;
          case 'hour':
            