Grid of simulations for a = 5 au and r_p = 10 km. Left: mean time to reach the scattering mass as a function of the initial surface density of planetesimals (Σ₁) and initial core mass (M_core,1). The light green colour indicates the cases compatible with the meteoritic record. For grey circles the growth is too slow, and for black ones, too fast. Right: total amount of heavy elements accreted until reaching Jupiter mass as a function of the initial surface density of planetesimals (Σ₁). Transparentcircles: all results. Solid circles: cases compatible with the meteoritic constraints.The green shaded area indicates the values compatible with estimates from Juno (Wahl et al. 2017).