Fig. 3From: A generalized self-thinning relationship for multi-species and mixed-size forestsResults for mixed stands of oak and beech. Global criterion (presented in Eq. 9) for different values of parameter α for oak, beech, and all other species. For each combination of α (between 0 and 3 for each species), the corresponding value of criterion is represented by a grayscale color. Optimal (smaller) values are in dark gray, in the center of the figureBack to article page