Time-dependent growth tracks starting at t₀ = 10τ_c for the circumbinary disc of DWD₁ with parameters r_c = 50 au, ξ = 0.02 (top panel), considering a constant photoevaporation rate of Ṁ_w = 10⁻⁷ M_⊙ yr⁻¹. The accretion rate and photoevaporation rate are shown in the bottom panel. In this case ΔṀ_gw (see Sect. 2.4.2) is smaller than in the top panel of Fig. 2. The masses of the GGs are shown in the top panel, which are lower than those indicated in Sect. 3.1.5.