Figure 6: q and κ versus αA/d (same data as in Fig. 5).

We see that q = 4/3 for 0 ≤ αA/d ≤ 1, and a nearly exponential behavior emerges for αA/d > 1 (∀d); similarly for κ. These results exhibit the universality of both q and κ. The red dot indicates the Barabási-Albert (BA) universality class q = 4/336. In what concerns the universal q = 4/3 cut-off (i.e., the 1/(q − 1) = 3 cut-off), see50 and references therein.