3D continuum correction of the model with stellar parameters T_eff = 5865 K, log g = 4.5, and [Fe/H] = 0.0 dex. Upper panel: fit to the upper envelope of the quotient between the 3D and 1D continuums. The different wavelength ranges used for the fit are plotted in different colors. Middle panel: original 3D continuum, shown in black, while the new continuum fitted is depicted in red. Bottom panel: difference between the 3D spectrum normalized with the original continuum, and the 3D spectrum normalized with the new fitted continuum. The shaded area corresponds to the ±0.2% of the normalized flux.