He density as a function of Rosseland mean optical depth assuming atmospheric parameters used in synthetic spectra studied in Sect. 4.2. T eff = 8000 K (full line), log Ca/He = −9, log Mg/He = −7.3, log H/He = −3.5. T eff = 6000 K (dashed line), log Ca/He = −10.5, log Mg/He = −7.3, and log H/He = −3.5.
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