Diagnostic plots for the determination of atmospheric parameters for the Sun. Upper panel: Fe i lines abundances vs. their lower energy and linear fit for the determination of Teff. Gray dashed line: average Fe i abundance. The magenta line is the linear fit, magenta-circled points are the ones considered in the fit. The LEAS is −8.0 × 10-4 per eV. Center panel: Fe i lines abundances vs. reduced EW (i.e., log 10(EW/λ) ) for the determination of Vturb. Gray dashed line: average Fe i abundance. Magenta symbols and line as in the top panel. Linear fit slope is 8.7 × 10-3. Bottom panel: Fe i (black) and Fe ii (red) lines abundances for the check of gravity through ionization equilibrium. The continuous lines represent averages, dashed lines 1σ intervals. A(Fe i) = 7.44 ± 0.06, A(Fe ii) = 7.45 ± 0.09.
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