this.xPoints.add(xValue);
                int seriesCount = this.data.size();
                for (int seriesNo = 0; seriesNo < seriesCount; seriesNo++) {
                    XYSeries dataSeries = (XYSeries) this.data.get(seriesNo);
                    if (!dataSeries.equals(series)) {
                        dataSeries.add(xValue, null);