Stellar mass surface density ploted against the average metallicity for a sub-sample of S11 and FIGGS galaxies with measured emission metallicities. The different classes of galaxies from S11 are represented by differently coloured filled squares. FIGGS galaxies are represented by violet open circles. The typical errorbars for the data points are represented by the black error bars. The dashed grey line in the background is the best-fit bivariate linear regression line (see text for details).
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