Distribution of PNe in NGC 6822 in an Hα image. In pink the objects with low metallicity (12 + log (O/H) < 8 and 12 + log (Ar/H) < 5.7); in blue, the high-metallicity ones (12 + log (O/H) > 8 and 12 + log (Ar/H) > 5.7. PN 6, with 12 + log (Ar/H) of 5.71 is marginally a young object).
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