Collisional growth of planetesimals at 1 au. Shown are scatter plots for eccentricity (first row), inclination (second row), and mass (third row). 4000 planetesimals are located at 1 au in a ring of width 0.085 au. The three columns show snapshots at different times. Planetesimals that grow more massive than 10⁻³ M_⊕ are shown as coloured filled circles. All other bodies are grey open circles. The colour and size of the symbols scale with the instantaneous mass.