Multivariate mortality rate estimates for A. alba (a) and P. abies (b). Bins for diameter-classes and growth-classes were obtained with the modified two-dimensional Ayer’s algorithm. Mortality model is independent of growth for DBH ≥ 45 cm with the only assumption that mortality increases with diameter. For DBH < 45 cm, the model assumes that mortality decreases both with growth and diameter. Mortality model combines size-dependent and growth-dependent mortality.