Fig. 4
Synthetic 1D NLTE spectral lines of sodium (solid lines) compared with the observed solar flux spectrum (dots) from Kurucz et al. (1984). In case of 818 nm line, which experiences the strongest deviations from the LTE, we also show the LTE line profile (dashed line). All synthetic spectral lines were computed using solar sodium abundance of A(Na) = 6.25.
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