Fig. 3

Football network from 1995 to 2015 visualized via (Bastian et al. 2009). Edges with high tie strengths (total number of football games between two countries) or edge overlap (ratio of common neighbors of the two nodes connected by the edge) are colored in red while edges with low strengths or overlap are depicted in green. Both (a) and (b) show that most green edges are between confederations and red edges are within confederations. Each node color corresponds to one confederation. Purple: UEFA; Blue: CAF; Sky blue: AFC; Red: OFC; Green: CONCACAF; Yellow: CONMEBOL