Li I 6707.8-Å line of the Sun. Panel a: 1.8-Å section of a deep PEPSI spectrum (thick black line) and the fit with a synthetic 3D NLTE spectrum (dashed line). The insert lists the best-fit free parameters. The residuals (thin lines) are enhanced by a factor 100 for better visibility and offset to ≈0.96 units in flux. Panel b: zoom into a 0.6 Å subsection centered on the two Li doublets. Observations are now indicated as open diamonds with error bars. The colored lines are based on the best fit from panel a but for three different isotope ratios as indicated in the insert. The dashed line is the best fit.
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