Difference between the mean O/H at the position of grid points (color-coded as in Fig. 4) and the expected O/H from the formulations of Li13 (open circles) and M10 (filled circles). ELOX galaxies at 0.5 <z< 0.62 are shown in panels a) and c), and at 0.62 <z< 0.75 in panels b) and d), with the lower panels showing only galaxies with T2 (disk) morphologies. Because typical O/H uncertainties are 0.1−0.2 dex, the agreement between the measured and expected O/Hs is quite good, especially in panel c).