Absorption profiles of the Na I D lines in HD 20945 8 compared against the observed absorption profile derived from ESPRESSO data, as presented in Casasayas-Barris et al. (2021). In the top row, the absorption points are shown in black, and their respective uncertainties are represented by a confidence interval (CI in the plot) band at the 1σ level. The absorption features computed using SOAPv4 are overplotted. They were based on input MARCS models with two Na I abundances (solar-like) reported in the literature. The subsequent rows display the residuals between the models and observations. The colors of the data points and CI bands correspond to the respective model color.