135731.fig.007a
(a)
135731.fig.007b
(b)
135731.fig.007c
(c)
135731.fig.007d
(d)
Figure 7: Closeness indices of test power grids (a) , (b) , (c) , and (d) obtained using three different definitions: the original definition —+—, the proposed modification —*—, and the centrality based solely on —□—.