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(a) Frequency vs. size plot 
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(b) Events ranked by size
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(c)  Events ranked by frequency
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(d) Very straight (log normal)
Figure 2: Histograms of event frequency versus size, event rank versus size, event rank versus frequency and the log-normal behavior test of the node degree of networks generated with the proposed evolving model with 𝑚 = 4 versus different self-probabilities.