Comparison of simulated and yield table values of stand characteristics of the Douglas-fir/beech mixed stand in the Speulderbos (a–d) and Freienwalde (e–h) (after Jansen et al., 1996). The lines indicate simulated values for Douglas-fir (dashed line) and beech (full line) and the symbols represent yield table values for Douglas-fir (squares) and beech (diamonds).