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FIG. 2. Asymptotic universal energy-phase relation of the Zn Josephson effect at Δ = −|J|/2 for chain lengths up to N = 20. (a) Asymptotic universal curve for even chains after scaling the phase by the system’s periodicity in Eq. (2) and the energy by the maximally pumped energy. (b) Scaled curve including odd chain lengths. (c) Convergence of the timereversal symmetric point’s energy for odd chains when onlyrescaling the phase.