Fig. 9
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Result of the Saha-Boltzmann analysis for Ca and Mg. Observed line ratios were computed from the epoch 2 ESPRESSO spectrum. Left panel: likelihood for the observed Ca II 8542 vs. Ca I 4227 ratio as a function of log ne and T. Right panel: theoretical Mg II 4481 vs. Mg I 5184 ratios as a function of T for log ne [cm−3] = 11,12,13,14. The red area marks the upper limit on the observed ratio.
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