Fig. 2: The average correlation matrix for the four indices of node importance over six real-world networks.

Here D, H, C and R represent degree, H-index, coreness, and cycle ratio, respectively. Details of the six networks are shown in Table 1. Each element is the averaged value of the correlation \(\tau\) between the two indices corresponding to its position over the six networks, and the value is visualized by the color. See detailed calculation of the correlation \(\tau\) in Methods.