Fig. 2From: Traceability and quality assessment of Norway spruce (Picea abies (L.) H.Karst.) logs: the TreeTrace_spruce databaseDiameter of the discs as a function of their height level in the tree and their location in the sample logs (large end or small end). Height levels 1, 2, 3 and 4 correspond to heights 0m, 4.5m, 9m and 13.5m, respectivelyBack to article page