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Gets or sets the distance between the data series in a 3-D chart as a percentage of the marker width.
This property applies to 3-D charts. The returned value is in the range from 0 to 500.
int GapDepth { get; set; }
Property GapDepth As Integer
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered3D, 20, 20, 300, 200).Chart;
chart.GapDepth = 200;
int gapDepth = chart.GapDepth;