Effect of the grain size on the equilibrium solution when varying the parameter a_dust from 0.1 μm to 1 mm: The case a_dust = 0.1 μm is shown in blue, a_dust = 1 μm in dark orange (fiducial model), a_dust = 10 μm in green, a_dust = 100 μm in red, and a_dust = 1 mm in purple. The panels show the various steady-state profiles of some key quantities, for the model parameters M_⋆ = 1 M_⊙, L_⋆ = 2 L_⊙, M_disk = 0.05 M_⋆, f_dg = 10⁻², and α_hydro = 10⁻⁴. Panels a–f show the same key quantities as in Fig. 7.