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Fig. 4

image

[Y/Mg] versus stellar age for stars with age determination errors smaller than one Gyr. The symbols are the same as in the previous plots. The black solid line is the linear fit of our data without considering the two oldest stars. The blue dashed line and the green dotted lines represent the linear fits from Nissen (2015) and Tucci Maia et al. (2016), respectively.

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