Abundance corrections for the same Fe i line as shown in Fig. 9, but computed for the 3D model with  [Fe/H]  = −3.0 and with velocity fields set to zero (left panel) and for the corresponding 1D hydrostatic MARCS model with  [Fe/H]  = −3.0 (right panel), assuming microturbulent broadening with ξ = 1.0 km s^-1 (solid lines), ξ = 2.0 km s^-1 (dotted lines), and ξ = 3.0 km s^-1 (dashed lines).