Mass-radius diagram for AU Mic b and c, together with all known exoplanets (grey dots) with a precision level that is better than 8% in radius (through transit) and 20% in mass (from RV). The population of young transiting exoplanets (<900 Myr) with measured masses is plotted as coloured dots according to their ages. The uncertainties of AU Mic b and c are shown as coloured shaded regions indicating 1, 2, and 3σ confidence regions. In the left panel, the iso-density lines are displayed as dashed grey lines. In the remaining panels where the population of exoplanets is plotted along AU Mic b and c, coloured lines indicate different composition models without gas and with a gas envelope from Zeng et al. (2019). The dotted and dashed lines show the models with temperatures of 300 and 500 K, respectively, of the corresponding specific entropy at 100 bar level in the gas envelope. The Earth, Uranus, and Neptune are also depicted as references. We include B22 and M22 as references because different results have been published for the same planet, and this refers to Barragán et al. (2022b) and El Mufti et al. (2023), respectively.