Individual (top) and stand average (bottom) relationships between diameter and height. Graphs illustrate diameter versus age (left column), versus height (centre column), and versus (H⁻¹.3) / ln ( N). The bottom row includes a quartic polynominal (black line) and the linear trend (dotted line, bottom right). The diameter-height graph (top centre) includes individual tree heights (black) and predominant height (grey, tallest 50 trees· ha− 1) for trees not measured for height.