Fig. 5

Variation in whole-disc density with relative height up the stem. The grey lines are smoothing curves fitted to the disc densities from each of 150 sites. The black lines show disc density predicted by model 3 for an average site (middle line, L = 0) and for sites at the 5th and 95th percentiles (lower and upper dashed lines, L = −59.3 and L = +59.3, respectively)