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Gets the axis group of the axis.
AxisGroup AxisGroup { get; }
ReadOnly Property AxisGroup As AxisGroup
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
IAxis axis = chart.Axes.Item(AxisType.Value, AxisGroup.Primary);
AxisGroup axisGroup = axis.AxisGroup;