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Gets or sets the line width of the sparklines in the sparkline group.
double LineWeight { get; set; }
Property LineWeight As Double
worksheet.Range["A1:C1"].Value = new object[] {1, 3, 2};
ISparklineGroup group = worksheet.Range["D1"].SparklineGroups.Add(SparkType.Line, "A1:C1");
group.LineWeight = 2.5;
double lineWeight = group.LineWeight;