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Gets or sets the axis group of the series.
The axis group indicates whether the series is plotted on the primary or secondary axis.
AxisGroup AxisGroup { get; set; }
Property AxisGroup As AxisGroup
worksheet.Range["A1:C4"].Value = new object[,] {{"Month", "Sales", "Target"}, {"Jan", 12, 30}, {"Feb", 18, 45}, {"Mar", 15, 40}};
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
chart.SeriesCollection.Add(worksheet.Range["A1:C4"], RowCol.Columns);
ISeries series = chart.SeriesCollection[1];
AxisGroup axisGroup = series.AxisGroup;