Fig. 9
Top row: departure coefficients for selected levels of Ca i and Ca ii as a function of log τ5000 in the models representing atmospheres of BD + 09°0352, BD −13°3442, and HE 0107-5240. Tick marks indicate the locations of line centre optical depth unity for Ca i 4226 Å (1) and Ca i 6162 Å (2). Bottom row: NLTE (continuous curve) and LTE (dashed curve) theoretical profiles of Ca i 4226 Å in the corresponding models.
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