Left: radial distribution of ionisation (in units of R_e), colour-coded as a function of the stellar mass log(M_⋆/M_⊙), as reported in the legend. The shaded regions represent the 16th and 84th percentiles of the distribution in each stellar mass bin taking into account the number of galaxies lying in the bin. Right: log(q) radial profile slopes as a function of stellar mass in units of dex .