Comparison of Hβ line profiles calculated with Linfor3D for the 3D (solid lines, averaged over 12 selected snapshots) and 1D_MLT (dashed lines) models in the case of two non-gray simulations at T_eff of 11 300 K and 12 390 K (the latter shifted by 0.2 units of flux for clarity). The dotted lines (indistinguishable from the 3D spectra in the figure) also show the  ⟨ 3D ⟩  profiles resulting from spatial and temporal averages of the 3D structures.