Extended Data Fig. 5: Supplementary measurement of the link depth.

a, M₁, M₂ and M₃ Weyl loops, with trajectories obtained from the analytical model (see main text), showing that M₁ links M₂ twice and M₃ twice. Energy-momentum photoemission cuts along the high-symmetry paths b, X₁ − X₂ and c, X₃ − X₁ obtained at photon energy hν = 642 eV. We observe d₁₂ = 0.56 ± 0.1 Å⁻¹ and d₃₁ = 0.61 ± 0.1 Å⁻¹, consistent with Extended Data Fig. 4. For both cuts, exactly one branch of each Weyl cone exhibits appreciable photoemission cross-section, as expected from the mirror-symmetric measurement geometry⁵⁹. d, Fermi surface acquired at hν = 642 eV, exhibiting an in-plane Weyl loop contour, M₁. We further observe spectral weight emanating along k_x and k_y from the center of M₁, corresponding to the linearly dispersive branches in (b, c), again suggesting that M₁ is linked by M₂ and M₃.