   chartMaxValue = Number.NaN,
        chartMinValue = Number.NaN;

    for (var d = 0; d < this.seriesSet.length; d++) {
      // TODO(ndunn): We could calculate / track these values as they stream in.
      var timeSeries = this.seriesSet[d].timeSeries;
      if (!isNaN(timeSeries.maxValue)) {
        chartMaxValue = !isNaN(chartMaxValue) ? Math.max(chartMaxValue, timeSeries.maxValue) : timeSeries.maxValue;
      }

      if (!isNaN(timeSeries.minValue)) {
        chartMinValue = !isNaN(chartMinValue) ? M