Notes.Z represents the metallicity. Zpn is obtained from from Planetary Nebulae; Zhii and Zhiib from HII regions (see text for discussion); Zcp from cepheids. It is expressed in oxygen abundance assuming 12+log(O/H) = 8.66 for the Sun (Grevesse et al. 2007) for planetary nebulae and HII regions, and in iron abundance for cepheids.
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