src/org/tiefaces/components/websheet/chart/objects/LineChart.java
@Override
	public final CTNumDataSource getCTNumDataSourceFromCTSer(
			final Object ctObjSer) {
		if (ctObjSer instanceof CTLineSer) {
			return ((CTLineSer) ctObjSer).getVal();
		}
		return null;
	}
@Override
	public final CTNumDataSource getCTNumDataSourceFromCTSer(
			final Object ctObjSer) {
		if (ctObjSer instanceof CTLineSer) {
			return ((CTLineSer) ctObjSer).getVal();
		}
		return null;
	}
/*
(non-Javadoc)

@see org.tiefaces.components.websheet.chart.objects.ChartObject#
getCTNumDataSourceFromCTSer(java.lang.Object)