t(k) = 2*Ek/(Nk*(Nk-1)), where 
Ek the number of edges among the Nk nodes haveing degreee higher than a 
given value k. 
 
REF: Colizza et al. Nature Physicas 2006 
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0000335#s2 
 
Systems Biology and Evolution Toolbox (SBEToolbox). 
Authors: James Cai, Kranti Konganti. 
(C) Texas A&M University. 
 
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