Fig. 6.
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Schematic neon versus oxygen abundances in planetary nebulae. The solar point is located at the abundances from Lodders (2003). The diagonal lines show the location for solar-scaled abundances (full line) and for neon abundances twice (dots), three times (dashed), and four times (dot-dashed) the solar value. Data are taken from different sources for planetary nebulae, as labelled.
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