1D NLTE abundance corrections for different spectral lines of sodium, as obtained in this work (black lines and symbols) and by Lind et al. (2011, red lines and symbols). Top panel: abundance corrections for the spectral lines located at λ = 568.2 nm (solid lines) and λ = 615.4 nm (dashed lines). Bottom panel: abundance corrections for the spectral lines located at λ = 568.8 nm (dashed lines) and λ = 818.3 nm (solid lines).