Fig. 4

Plots of the statistics obtained in the calibration process including the random tree selection method, for Eq. 9 (first row), Eq. 10 (second row), Eq. 11 (third row) and Eq. 12 (fourth row), for each species. Zero trees for calibration represent the fixed-effects model. The X-axis shows aggregate values to an average number of trees per plot, because the evaluation dataset has a modal value of five species per plot. Numbers in the legend refer to the species groups outlined in the text