Distribution of f_env as a function of planet mass for the sub-Saturns in our sample. We derived three different f_env for a low (left panel), medium (middle panel), and high (right panel) atmospheric metallicity case. The two planets with unreliable mass or radius measurements are indicated by the diamond markers. Black points are synthetic planets from the planetesimal accretion formation model of Alessi et al. (2020). The gray shaded area indicates planets with masses below the mass limit of our sample. The synthetic planets represent young planets at a time just after their natal disk has photo-evaporated. While they will contract their envelope over time, this does not affect the total mass and envelope mass fraction.