Left panel: median metallicity as a function of planet radius (black points). The shaded areas represent the dispersion between the 16% and the 84% (blue), and the dispersion between the 33% and the 67% (purple). Only EHSs with an error in metallicity lower than 0.025 dex have been considered. Right panel: median metallicity as a function of planet mass for planets with a radius lower (black) and higher (blue) than 1.1 R_Jup. Error bars show the 33-67% interval of the metallicity distribution for each bin in planetary radius.