Notes. “Plateau” (models labelled “p”) indicates that the simulation has a constant density in the inner part (see text, Sect. 2.2). Φ is the dust-to-gas ratio, f_c the covering factor (used for the Cloudy simulations), and θ_flow the opening angle (used in the Skirt simulations to define a 3D dust distribution). In all models, the hotspot temperature is set to T_hs = 35 000 K (i.e., “inter”), except for the models with f_c = 0.71, for which we applied three different hotspot temperatures (“cold”: T_hs = 30 000 K; “inter”: T_hs = 35 000 K; “hot”: T_hs = 40 000 K) with different spectra (see Sect. 2.4.3). “A”, “B”, and “C” refer to the evolutionary phase (see Fig. 2 and Table 1), “x.xx” is a three-digit number for the covering factor, “df” stands for dust-free, “ld” for low dust (i.e., Φ = 2 × 10^-5), “hd” for high dust (i.e., Φ = 4 × 10^-3).