The size of each circle is proportionate to the number of species
present matching our inclusion criteria. The Venn diagram indicates
spatial exclusivity, which is used to calculate biogeographical
distribution metrics of endemism , overlap , orcosmopolitanism . For example, in our Malesian dataset there are
318 Dipterocarpaceae, thus Sundaland endemism is calculated as
264/318 = 0.83; Sundaland overlap as (264+30+0+3)/318 = 0.93; andcosmopolitanism as 3/318 = 0.01. The endemism metrics are
translated into a CYMK hex code, with Sundaland as magenta, Wallacea as
yellow, and Sahul as cyan; Cosmopolitanism as black. These three
families are labeled on all scatterplots as 1) Dipterocarpaceae, 2)
Ericaceae, 3) Pteridaceae.