The method define the modularity as Q(σ→)=1Cnorm∑i,j(Cij-Cij(r)-Cij(m))δ(σi,σj)=1Cnorm∑i,jCij(g)δ(σi,σj)(15) constituted from the eigenvalues {λi} less than or equal to λ+ (usually, the eigenvalues smaller than λ− are included as well) and their corresponding eigenvectors vi.