Left: normalised radial density distribution of the oxygen abundance for the M13-N2 (top) and the D16 (top) calibrators. The galactocentric distances are normalised to the abundance scalelength rO/H. The white dots represent the mean oxygen abundance values, with the error bars indicating the corresponding standard deviations, for bins of 0.3 re. The solid black line represents the error-weighted linear fit derived for those mean values within the range between 0.5 and 1.5 re. Right: mean oxygen abundance radial profiles derived for galaxies belonging to three different stellar mass bins: log (M/M⊙) ≤ 10.69, blue diamonds; 10.69 < log (M/M⊙) ≤ 11.05, red squares; log (M/M⊙) > 11.05, purple triangles. The limits of the bins were chosen to ensure a similar number of elements in each bin. The symbols represent the mean oxygen abundance values, with the error bars indicating the corresponding standard deviations, for bins of 0.25 rO/H. Dashed vertical lines indicate the average position of the inner drop and the flattening in the outer parts.
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