Fig. 12
Distributions of the nebular Ne/Ar abundance ratio for the three analysed Galactic samples: disk PNe from Vela-Norma direction (top), bulge PNe (middle), and inner-disk PNe (bottom). The median values, the 25 and 75 percentiles are marked with three short vertical lines above each histogram. Numbers of objects used are shown in the left-hand parts of the panels below sample names.
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