Fig. 8.
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Metallicity as a function of extinction for the spectroscopic subsample of the proposed BBs (purple error bars). The samples of Cardamone et al. (2009) and Izotov et al. (2011) are shown with green rhombuses and red X’s, respectively. Uncertainties are not shown for the latter for clarity. The black dashed line shows the metallicity-extinction relation of SFGs by Kouroumpatzakis et al. (2021).
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