ue to the `value` placeholder (ease testing)
                  $("#value").html(sent.oneSecondRate);
                }
                that.redraw();
              });
            };
          }
        }
      },
      title: {
        text: 'Sent messages throughput'
      },
      xAxis: {
        type: 'datetime',
        tickPixelInterval: 150
      },
      yAxis: {
        title: {
          text: 'Value'
        },
        plotLines: [{
          value: 0,
          width: 1,
          color: '#8080