Metallicity as a function of stellar mass for spectroscopically confirmed absorbing galaxies, colour-coded by redshift. Squares indicate the results of this work, whereas circles refer to the absorption-selected reference sample. The M 08 mass-metallicity relations based on luminosity-selected samples, and the M 13 predicted mass-metallicity relations for absorption-selected samples are overplotted at four representative redshifts. Top panel: results assuming the metallicity measured in absorption. Bottom panel: results with an impact-parameter dependent correction factor and a gradient cut-off at a truncation radius of 12 kpc. The object encircled in red represents the outlier from Q 1209+107 PA2.
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