Gas-phase metallicity dependence on the stellar-mass surface density for the galaxy sample, binned according to the stellar-mass surface density bins. Spearman’s correlation coefficient, r_s, is included in all the plots. The points are colour-coded by the star-formation-rate surface density. Errorbars show the uncertainty of the surface mass density from the DAP fits in each bin as well as the standard deviation of metallicity in each bin.