Assortativity as a function of density of links.

<p>The lines show the behavior of three models ( triangle, rhomboid and random, averaged of 100 realizations), while the points correspond to the real networks reported in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0021028#pone.0021028-Bascompte4" target="_blank">[22]</a>. The upper half of the plot correspond to assortative networks, while the lower half contains the disassortative ones (including all the natural systems). The density of links represents the number of links present in the system divided the total possible links (). The networks represented in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0021028#pone-0021028-g002" target="_blank">Fig. 2</a> are marked, as well as four other networks used below.