Extended Data Figure 1: Histogram of the collected measurements of forest tree density in each biome around the world (n = 429,775).
![Extended Data Figure 1](https://cdn.statically.io/img/media.springernature.com/full/springer-static/image/art%3A10.1038%2Fnature14967/MediaObjects/41586_2015_BFnature14967_Fig6_ESM.jpg)
The red line and the blue dotted lines indicate the mean and median for the collected data, respectively. Data in each biome fitted a negative binomial error structure.