How to set size of bubbles for Excel bubble chart in C#, VB.NET?

// Set bubble size
IChartSerie serie = chart.Series.Add();
serie.SerieFormat.CommonSerieOptions.BubbleScale = 130;

using Syncfusion.XlsIO;
using System.Reflection;
using System.IO;
 
namespace ChartSample
{
    class Program
    {
        static void Main(string[] args)
        {
            using (ExcelEngine excelEngine = new ExcelEngine())
            {
                IApplication application = excelEngine.Excel;
                application.DefaultVersion = ExcelVersion.Excel2016;
 
                // Open existing workbook with data entered
                Assembly assembly = typeof(Program).GetTypeInfo().Assembly;
                Stream fileStream = assembly.GetManifestResourceStream("ChartSample.InputTemplate.xlsx");
                IWorkbook workbook = application.Workbooks.Open(fileStream);
                IWorksheet worksheet = workbook.Worksheets[0];
 
                // Initialize chart
                IChartShape chart = worksheet.Charts.Add();
                chart.ChartType = ExcelChartType.Bubble;
 
                // Apply chart elements
                //Set chart title
                chart.ChartTitle = "Bubble Chart";
 
                // Set legend
                chart.HasLegend = false;
 
                // Set category Labels and values
                IChartSerie serie = chart.Series.Add();
                serie.CategoryLabels = worksheet.Range["B2:B4"];
                serie.Values = worksheet.Range["C2:C4"];
                serie.Bubbles = worksheet.Range["D2:D4"];
 
                // Set bubble size
                serie.SerieFormat.CommonSerieOptions.BubbleScale = 130;
 
                // Positioning the chart in the worksheet
                chart.TopRow = 8;
                chart.LeftColumn = 1;
                chart.BottomRow = 23;
                chart.RightColumn = 8;
 
                // Saving the workbook
                Stream stream = File.Create("Output.xlsx");
                workbook.SaveAs(stream);
            }
        }
    }
}

Imports Syncfusion.XlsIO
Imports System.Reflection
Imports System.IO
 
Namespace ChartSample
 
    Class Program
 
        Public Shared Sub Main(ByVal args() As String)
            Using excelEngine As ExcelEngine = New ExcelEngine
                Dim application As IApplication = excelEngine.Excel
                application.DefaultVersion = ExcelVersion.Excel2016
 
                'Open existing workbook with data entered
                Dim assembly As Assembly = GetType(Program).GetTypeInfo.Assembly
                Dim fileStream As Stream = assembly.GetManifestResourceStream("ChartSample.InputTemplate.xlsx")
                Dim workbook As IWorkbook = application.Workbooks.Open(fileStream)
                Dim worksheet As IWorksheet = workbook.Worksheets(0)
 
                'Initialize chart
                Dim chart As IChartShape = worksheet.Charts.Add
                chart.ChartType = ExcelChartType.Bubble
 
                'Apply chart elements
                'Set chart title
                chart.ChartTitle = "Bubble Chart"
 
                'Set legend
                chart.HasLegend = False
 
                'Set category Labels and values
                Dim serie As IChartSerie = chart.Series.Add
                serie.CategoryLabels = worksheet.Range("B2:B4")
                serie.Values = worksheet.Range("C2:C4")
                serie.Bubbles = worksheet.Range("D2:D4")
 
                'Set bubble size
                serie.SerieFormat.CommonSerieOptions.BubbleScale = 130
 
                'Positioning the chart in the worksheet
                chart.TopRow = 8
                chart.LeftColumn = 1
                chart.BottomRow = 23
                chart.RightColumn = 8
 
                'Saving the workbook
                Dim stream As Stream = File.Create("Output.xlsx")
                workbook.SaveAs(stream)
            End Using
        End Sub
    End Class
End Namespace