Mass vs. semimajor axis of synthetic planet populations for different Σ_P distributions after 100 million years. Each setup contains one single planetary embryo. The initially set distributions for Σ_P are Σ_P = Σ₀ ⋅ r^−0.9 (initial gas density slope), Σ_P = Σ₀ ⋅ r^−1.5 (mmsn) and Σ_P = Σ₀ ⋅ r^−2.1 (Lenz et al. 2019). Bottom right panel: population in which planetesimals form over time using the model described in Sect. 2. The circles given around the data points show the mass fraction of envelope mass over core mass. The numbers of systems are 1999 (Σ_P ∝ r^−0.9), 1990 (Σ_P ∝ r^−1.5), 1961 (Σ_P ∝ r^−2.1), and 1945 (Σ_P- dyn).