Mean values of the ages and masses for the reduced sample of 88 objects (blue dots in Fig. 10) for which interpolation in the Kiel and HR diagrams yield consistent results. Age (mass) of each object is calculated as the geometric (arithmetic) mean of the values yield by the interpolation in each diagram. The vertical dashed line indicates the canonical value of 30 Kyr value beyond which PNe are not expected to survive.
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