// create chart
Chart chart = new ChartBuilder().chartType(ChartType.Area).width(800).height(400).title("Real-time Bitcoinium Order Book - BITSTAMP_BTC_USD").xAxisTitle("BTC").yAxisTitle("USD").build();
chart.getStyleManager().setLegendPosition(LegendPosition.InsideNE);
// add series
Series series = chart.addSeries(BIDS_SERIES_NAME, xAxisBidData, yAxisBidData);
series.setMarker(SeriesMarker.NONE);
series = chart.addSeries(ASKS_SERIES_NAME, xAxisAskData, yAxisAskData);
series.setMarker(SeriesMarker.NONE);
return new XChartPanel(chart);