Similar to Fig. 3, but now showing variants of model m20mix100mH9 in which the Ca mass fraction is progressively increased in the O-rich shell by powers of ten and starting from about 7 × 10−5, the solar metallicity value (the Ca mass fraction profile is shown in the bottom left panel). Notice the dramatic reduction on the [O I]/[Ca II] line ratio as the Ca abundance is increased. Even in the richest Ca model, the Ca mass is still less than 10% of the O mass.
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