Trees used in the analysis of volume uncertainty in cylinder fitting. All trees are sycamore (Acer pseudoplatanus) from Wytham Wood. The height, DBH, branch length, volume and AGB of the resulting QSMs derived from these are given in each case (using ρ taken from http://www.wood-database.com/sycamore-maple/) are as follows. (a) 1009: H 21.2 m, DBH 0.22 m, Lbranch 680 m, Vtot 1550 l, AGB 0.95 t. (b) 213: H 24.9 m, DBH 0.49 m, Lbranch 1350 m, Vtot 4600 l, AGB 2.83 t. (c) 138: H 23.5 m, D 0.47 m, Lbranch 1000 m, Vtot 4200 l, AGB 2.57 t. (d) 1570: H 25.8 m, D 0.47 m, Lbranch 760 m, Vtot 2890 l, AGB 1.77 t. (e) 255: H 26.3 m, D 0.53 m, Lbranch 2600 m, Vtot 8370 l, AGB 5.15 t.