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Fig. 12
Optical depths of He I lines over time, in the innermost He/N envelope shell of model 12C. Lines with the meta-stable 2s(3S) as the lower level are marked in solid black, lines with the meta-stable 2s(1S) as the lower level are marked in dashed blue, and lines with non-metastable lower levels are marked in dash-dotted red.
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