3D atmospheric parameter corrections found by fitting our grid of ⟨3D⟩ spectra with the reference grid of 1D spectra relying on the ML2/α = 0.8 parameterisation of the MLT. The 1D = 3D reference parameters are on the intersection of the dotted lines, and 3D corrections are read by following the solid lines. We utilised a resolution of 3 Å and the cores of the deeper lines were removed from the fits (see Eq. (4)). The red dashed line represents the position of the maximum strength of the Hβ line in the 1D models. Tabulated values are available in Appendix B.
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