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Fig. 1

Metallicity distribution of the DGS (purple), KINGFISH (orange) and G11 (green) samples from 12 + log(O/H)= 7.14 to 9.10. The total distribution is indicated in grey. Solar metallicity is indicated here as a guide to the eye, as well as the 1/50, 1/10, 1/5 and 2 Z⊙values.
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