Sub Macro2()
Dim Cel As Range, RDon As Range, Ser As Series
While Graphique2.SeriesCollection.Count > 0
Graphique2.SeriesCollection(1).Delete: Wend
For Each Cel In Feuil1.Columns(1).SpecialCells(xlCellTypeConstants, 2)
If Cel.Value = "ù" Then
Set RDon = Cel.CurrentRegion
Set Ser = Graphique2.SeriesCollection.NewSeries
Ser.Name = Cel(1, 3).Value & "=f(" & Cel(1, 2).Value & ")"
Ser.XValues = "=" & RDon(2, 2).Resize(RDon.Rows.Count - 1).Address(External:=True)
Ser.Values = "=" & RDon(2, 3).Resize(RDon.Rows.Count - 1).Address(External:=True)
End If
Next Cel
End Sub