Fig. 4From: An integrated method for high-resolution definition of new diameter-based fine root sub-classes of Fagus sylvatica L.The loading values for PC-1 (a) and PC-2 (b) showing a distribution of micrometer-diameter units into groups. Dendrogram showing the clustering of the new sub-classes: 0–0.3, 0.3–1.0, and 1.0–2.0 mm (c)Back to article page