Normalised surface gas density profiles Σ_g, norm(τ, R) for our set of simulations at τ = 0.5, 1, and 2 (see text; Σ_g, norm(τ, R) = Σ_g/Σ_g(τ = 0, R)). All Σ_g, norm profiles have been divided by the value of Σ_g, norm at R = 2.2 ⋅ l_*, for legibility. Each thin blue curve represents a low stellar mass model (< 10¹⁰ M_⊙) and each thin red curve corresponds to a higher stellar mass model (≥ 10¹⁰ M_⊙; see inset in the top left panel). The thick blue (resp. red) line in each panel is the associated median of the thin blue (resp. red) curve. The top panels show models that have formed a bar, sustained until the end of the simulation. The bottom panels illustrate the unbarred models (which are mostly those with large initial spheroids, e.g. G015 and G032, or extended initial discs, e.g. G043; see Appendix A).