Fig. 6

Observed radial profiles of WD for each plantation (a) and spacing level (b) fitted with locally weighted smoothing functions (“loess”) to all observations, which are represented by grey lines. The predicted WD given by Eq. (6), for each spacing treatment in the Highlands Plantation, is indicated in (c) and presented on a radius scale in (d). Grey vertical lines in (d) represent the maximum radial distance (in all directions) bounded by a given board position (see Fig. 1)