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. 2021 Oct 13;598(7880):293–297. doi: 10.1038/s41586-021-03868-7

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© The Author(s) 2021

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Extended Data Fig. 3 — a, C3 symmetry holds when S₁₂ = S₂₃ = S₃₁ as well as S₁₁ = S₂₂ = S₃₃, which is very well satisfied in the considered frequency range. b, Eigenvalues of the measured scattering matrix, with nearly-unitary behaviour over the entire experimental bandwidth. c, ξ and η parameters used to approximate the real scattering matrix with a C3-symmetric unitary matrix. The red area is the Chern phase, and the blue area the anomalous one. d, Error in % made by approximating the real scattering matrix with equation (4) over the entire bandwidth.