Disc gas density structure from hydrostatic models 1 and 2 (R_out = 2 AU, M_disc = 5 × 10^-6 M_⊙) between 2 and 15 AU. The left panel corresponds to the model with dust settling (model 1), the right panel to the model without dust settling (model 2). The dust temperature contours are overplotted in black. The red contours correspond to the Stokes numbers (S_t = 0.1, 1, and 10 contour values).