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Eigenvalues and Betti numbers vs isovalue (c) of the benzene system with η = 0.45 and max(ρ) ≈ 1.1. i shows the smallest eigenvalues of the T set. The drops at c = 0.12 correspond to snapshots in Figs. 10 a and b. The drops at c = 0.22 correspond to snapshots in Figs. 10 c and d. ii shows the smallest eigenvalue of the N set. The drops at c = 0.9 correspond to snapshots in Figs. 10 g and h. iii shows the smallest eigenvalues of the C set.
