Fig. 1
From: Variation of cork porosity along the stem in harvested cork oak (Quercus suber L.) trees
Profile of stem cross-sectional area over cork (cm2) assuming a circular outline and corresponding to stem diameters measured on the 76 sampled trees. Cork samples were collected from each tree at various fixed stem heights h (starting from 0.30 m above ground), and the lenticular channels were analysed in the cross-section of each sample. The number of trees (n) and corresponding number of cork samples (cn) are also presented for each h, ranging from 28 trees and 56 cork samples (28 cork samples at each fixed stem height, h = 0.30 m and 1.30 m) to 2 trees with 10 cork samples (2 cork samples at each fixed stem height, h = 0.30 m, 1.30 m, 2.30 m, 3.30 m and 4.30 m)