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Gets or sets the data-marker size in points.
Use this property to retrieve the marker size applied to the series.
int MarkerSize { get; set; }
Property MarkerSize As Integer
worksheet.Range["A1:B5"].Value = new object[,] {{1, 10}, {2, 12}, {3, 9}, {4, 15}, {5, 11}};
IChart chart = worksheet.Shapes.AddChart(ChartType.XYScatter, 20, 20, 300, 200).Chart;
chart.SeriesCollection.Add(worksheet.Range["A1:B5"]);
ISeries series = chart.SeriesCollection[0];
series.MarkerSize = 10;
int markerSize = series.MarkerSize;