Spatially resolved line equivalent widths of the Mg i 5183 Å  line at disk-center intensity (μ = 1) in a high-resolution (240²) snapshot of the hydrodynamical model, assuming A(Mg) = 3.80. Top left: NLTE (right: LTE) equivalent widths. Bottom left: NLTE equivalent width correction. Red and blue colors carry the same meaning as in Fig. 3. Bottom right: granulation pattern imprinted on the relative continuum intensity.