public XYSeries getSeries( String seriesName ) {
        XYSeries series = new XYSeries(seriesName);
        dataset.addSeries(series);
        return series;
    }
public XYSeries getSeries ( String seriesName ) { XYSeries series = new XYSeries ( seriesName ) ; dataset . addSeries ( series ) ; return series ; }
Get {@link Series} to be populated.

<p>Teh series is added to the dataset.

@param seriesName the name of the series to add.
@return the {@link XYSeries} to use.