Characteristics of the Norway spruce and European beech pure stands which serve as reference for revelation of mixing effects on the neighbouring mixed plots. Shown is (a) top height h_o at age 100 and (b) periodic mean annual volume increment PAIV. The large rhombi indicate the species-specific mean values of h_o (N. sp. 35.1 m; E. b. 29.9 m) and PAIV (N. sp. 14.7 m³ ha⁻¹ y⁻¹; E. b. 10.5 m³ ha⁻¹ y⁻¹).