'graphique
Dim Gph As Chart, Sér As Series
Set Gph = ActiveSheet.ChartObjects.Add(100, 100, 300, 200).Chart
Gph.ChartType = xlLineMarkers
Set Sér = Gph.SeriesCollection.NewSeries
Sér.Name = "='Rendements'!R23C1"
Sér.Values = "='Rendements'!R23C4:R23C" & k
Sér.XValues = "='Rendements'!R1C4:R1C" & k
Set Sér = ActiveChart.SeriesCollection.NewSeries
Sér.Name = "='Rendements'! etc.