Temperature (panels a and b) and gas density (panels c and d) maps for the model MREF in the initial configuration at t = t₀ and at the end of the quiescent phase, shortly before the TI is triggered, t = t_TI − ∆t. Yellow contour lines depict the region of dust sublimation (T = T_s), black lines show the ionisation transition from the MRI active zone to the dead zone (T = T_MRI), and green lines mark the radial optical depth τ, = 2/3 surface. In panels c and d, the red contours are drawn at ρ_gas = 10⁻⁹ which corresponds to a dust density of ρ_dust = 10⁻¹².