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Structure and schematic dynamics of the two networks considered in Palla et. al., Nature 446, 664 (2007) (this is Figure 1 from the paper). (a) The co-authorship network . The figure shows the local community structure at a given time step in the vicinity of a randomly selected node. (b) As (a) but for the phone-call network. (c) The filled black symbols correspond to the average size of the largest subset of members with the same zip-code, <n<sub>real</sub>>, in the phone-call communities divided by the same quantity found in random sets, <n<sub>rand</sub>>, as a function of the community size, s. Similarly, the open symbols show the average size of the largest subset of community members with an age falling in a three-year time window, divided by the same quantity in random sets. The error bars in both cases correspond to <n<sub>real</sub>> / ( <n<sub>rand</sub>> + σ<sub>rand</sub>) and <n<sub>real</sub>> / ( <n<sub>rand</sub>> - σ<sub>rand</sub>) where σ<sub>rand</sub> is the standard deviation in the case of the random sets. (d) The <n<sub>real</sub>>/s as a function of s, for both the zip-code (filled black symbols) and the age (open symbols). (e) Possible events in community evolution. (f) The identification of evolving communities. The links at t (blue) and the links at t+1 (yellow) are merged into a joint graph (green). Any CPM community at t or t+1 is part of a CPM community in the joined graph, so these can be used to match the two sets of communities.