formats the trendline for the first series in a chart:
Sub FormatLineOrBorders()
Dim myChart As Chart
Set myChart = ActiveChart
With myChart.SeriesCollection(1).Trendlines(1).Format.Line
.DashStyle = msoLineLongDashDotDot
.ForeColor.RGB = RGB(50, 0, 128)
.BeginArrowheadLength = msoArrowheadShort
.BeginArrowheadStyle = msoArrowheadOval
.BeginArrowheadWidth = msoArrowheadNarrow
.EndArrowheadLength = msoArrowheadLong
.EndArrowheadStyle = msoArrowheadTriangle
.EndArrowheadWidth = msoArrowheadWide
End With
End Sub
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