Fig. 2
From: Modularity in complex multilayer networks with multiple aspects: a static perspective
Aspect-layer representation of the multilayer network model. The within-layer edges are denoted with solid lines and the couplings are denoted with dotted lines where different colors indicate the couplings of different aspects. The position of a layer in a multilayer network can be specified by determining which aspect it belongs to and its serial number within the aspect. For example, the layer at the bottom right can be located as (2, 3) since it is in aspect (II) and layer 3. Such representation avoid the problem caused by increasing aspect numbers