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Fig. 7
The evolution for O/H, Ne/H, S/H Cl/H and Ar/H for two models, M4Ckoba (solid line) and M1Rkoba (dashed line), based on Kobayashi et al. (2006) yields. The filled circles, filled squares, and filled triangles represent the average observational values for H ii regions, young, and old PN populations, respectively.
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