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LineStyle Property [Excel 2003 VBA Language Reference]
|XlLineStyle can be one of these XlLineStyle constants.|
expression Required. An expression that returns one of the objects in the Applies To list.
This example puts a border around the chart area and the plot area of Chart1.
With Charts("Chart1") .ChartArea.Border.LineStyle = xlDashDot With .PlotArea.Border .LineStyle = xlDashDotDot .Weight = xlThick End With End With