Fig. 3From: Contribution of forest wood products to negative emissions: historical comparative analysis from 1960 to 2015 in Norway, Sweden and FinlandHeat map of the covariance coefficients of the historical trends of harvested volumes within each country (diagonal) and between each two countries, with a breakdown on the tree species and class, where the first capital letter indicates the tree species (S: Spruce; P: Pine; B: Birch) while the second letter indicates the wood class (s: saw logs; p: pulpwood; e: wood for energy)Back to article page