Fig. 1

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Term diagrams of the Ca model atom used in the NLTE analysis. The dashed horisontal line marks the ground state of Ca II. The four states of Ca I with highest excitation potential are super-levels, corresponding to all or some of the individual fine-structure levels for n = 5 − 8. The transitions used for detailed spectral analysis are marked with thick lines, and their approximate wavelengths given in Å.

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