Evolution of the maximum of the A₂ coefficient (top panels), the mass of gas within the central 1 kpc normalised by the initial mass of gas within the same radius (middle panels), and the SFR (bottom panels). The evolution is shown through the dimensionless parameter τ, which is the ratio between the time of the simulations and the corresponding time when A₂ reaches the value of 0.2. The dashed vertical lines and shaded coloured areas show peculiar values of τ we use to describe the phases of the fuelling (i.e, τ ∈ 0 − 1 (blue area); τ ∈ 1 − 1.5 (purple area); τ ∈ 1.5 − 2 (orange area)). The colour code and the meaning of the different lines are the same as in Fig. 8.