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Fig. 4.

image

PNe specific number vs stellar metallicity for Buzzoni et al. (2006) sample galaxies covered also by the Atlas3D integral-field spectroscopic survey (see McDermid et al. 2015), for two different star formation history measurements: full spectral fitting from a single-age stellar population (left panel) and full-index-fitting based on a focused set of absorption lines (right panel).

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