Fig. 2From: Coastal and interior Douglas-fir provenances differ in growth performance and response to drought episodes at adult ageRelationship between growth index (%) and soil water deficit (dimensionless) at site level averaged for all provenances: a in the Félines trial, and b in the Le Treps trial. Year 1996 of the Félines trial and years 2002 and 2007 of the Le Treps trial were not taken into account in the regression fit (see section 3.1)Back to article page