Sample cross-sections along the x-axis (at y ≈ 2500 km in Fig. 1) showing the minimal residual intensity for three lines as indicated above each panel and three methods (thick solid: 3D NLTE; thin solid: 1D NLTE, dashed: LTE). Local intensity maxima correspond to intergranular lanes (see Fig. 1). The numbered indicators on top of the panels mark x locations discussed in the text.
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