score:1

Accepted answer

To achieve it you can add points with null values to the second series. Check the code and demo posted below.

Code:

  chart: {
    events: {
      load: function() {
        var chart = this,
          series1 = chart.series[0],
          series2 = chart.series[1],
          x, y;

        setInterval(function() {
          x = (new Date()).getTime();
          y = Math.round(Math.random() * 100);
          series1.addPoint([x, y], false, true);
          series2.addPoint([x, null], false, true);

          chart.redraw();
        }, 2000);
      }
    }
  }

Demo:


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