Heavy-element mass as a function of planet mass for the full (0.1 ≤ M_p(M_J)≤10, top) and limited samples (0.3 ≤ M_p(M_J)≤2, bottom). The scatter points and error bars show the inferred heavy-element mass by the thermal evolution models. Solid lines show the fits constructed by Bayesian regression, and the shaded contours are the one and two σ uncertainties. Planets around FGK stars are depicted in blue, while planets around M-dwarfs are orange and green depending on the age prior that was used (see text for details).