Proportion of trees belonging to each of five life forms in each octave (two-fold) wide stem diameter class. Life forms are shrubs (D950.1 < 5 cm),
treelets (5 cm _ D950.1 < 12 cm), understorey trees (12 cm _ D950.1 <
25 cm), canopy trees (25 cm _ D950.1 < 60 cm) and emergents (D950.1 _
60 cm).