(a)  Spatial network model
(b) Null model of spatial network model
Figure 2: (Color online) The relationship between the topological shortest path length versus the resized distance between any two nodes for both the spatial network model in [8] and its null model. Here, in the resized distance , denotes the actual geodesic distance and denotes the geodesic distance between two neighboring nodes in the geographical space. The degree exponent is set to 3 and the clustering strength in the spatial network model in [8] is set to 1.1.