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Gets the chart format of the axis.
Use the returned IChartFormat object to access the fill and line formatting settings of the axis.
IChartFormat Format { get; }
ReadOnly Property Format As IChartFormat
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
IAxis axis = chart.Axes.Item(AxisType.Value, AxisGroup.Primary);
IChartFormat format = axis.Format;
format.Line.Color.RGB = Color.Blue;