Many biological and man-made networked systems are characterized by the
simultaneous presence of different sub-networks organized in separate layers,
with links and nodes of qualitatively different types. While during the past
few years theoretical studies have examined a variety of structural features of
complex networks, the outstanding question is whether such features are
characterizing all single layers, or rather emerge as a result of
coarse-graining, i.e. when going from the multilayered to the aggregate network
representation. Here we address this issue with the help of real data. We
analyze the structural properties of an intrinsically multilayered real
network, the European Air Transportation Multiplex Network in which each
commercial airline defines a network layer. We examine how several structural
measures evolve as layers are progressively merged together. In particular, we
discuss how the topology of each layer affects the emergence of structural
properties in the aggregate network.

本文通过研究真实数据来解决一个问题，即当多层网络聚合成一个网络表示时，在结构方面是否存在特征，例如多层系统、综合网络等等。本文具体分析了欧洲航空运输复合网络的结构特征，并讨论每个网络层的拓扑如何影响综合网络的结构特征。