Upper panel: growth of a planet for M_core,1 = 10 M_⊕ and Σ₁ = 15 g cm⁻², with (green) and without (purple) the effect of the capture radius. The solid lines show the growth of the core and the dashed ones the growth of the envelope. Bottom panel: evolution of capture radius in units of core radius for the growth cases shown in the top panel. In the purple case the capture radius is always fixed to the core radius. The green curve drops to a radius of 1.8 R_Jup when the detached phase starts.