Figure 4 Relationships of branch length (L ) and diameter (d ) grouped by the relative vertical position in the crown (upper, intermediate and lower) (A); relationships of L and T in the upper layer branches grouped by growth vigour levels (superior, moderate, inferior) (B), in the intermediate layer grouped by vigour (C), in the lower layer grouped by vigour (D). Statistical parameters for standard major axis (SMA) regressions are shown in Table 2.