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Eigenvalues and Betti numbers vs isovalue (c) of the eight-body system with η = 1.53 and max(ρ) ≈ 1.1. i shows the Fiedler values of the T set and persistent Betti-0 numbers. ii shows the Fiedler values of the C set and persistent Betti-1 numbers. iii illustrates the comparison of and persistent β2.
