Scatterplot Matrix of the linear dependencies between topological metrics. The scatter-plot matrix shows all pair-wise correlations between the topological metrics measured for our networks: scale-free fitting index (SFFI), average path length (APL), Diameter, Self-Similarity Index (SSI), Average Clustering Coefficient (ACC), Transitivity and modularity. Each small chart represents the correlation between the metrics described in the corresponding diagonal elements. A linear relationship between all pair-wise combinations of SSI, ACC, Transitivity and Modularity is clearly evident. Also APL and Diameter are linearly correlated.