Figure 1.

Relationship between δ¹³C-values and vine water deficit thresholds in grapes and wine, respectively. Three levels of vine water deficit are defined: slight water deficit (δ¹³C-values lower than −24.5% in grapes and −26.2% in wine); moderate water deficit (δ¹³C-values between −24.5 and −23.0% in grapes and −26.2 and −24.7% in wine); severe water deficit (δ¹³C-values higher than −23.0% in grapes and −24.7% in wine).