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The plot shows the average in-degree 
of the neighbours of nodes with a given out-degree 
+ for an ensemble of networks with 
and N = 1000. The dependence of 
on 
+ clearly indicates that nodes with low out-degree link preferentially to nodes of high in-degree, and nodes with high out-degree link mostly to nodes of low in-degree. The monotonically decreasing dependence confirms the strong disassortative nature of the networks.
