Density in the meridional plane of model MREF, a young solar-type star with a radially uniform mass accretion rate of 3.6 × 10⁻⁹M_⊙∕yr, a dust-to-gas mass ratio for small grains of 0.001 and stress-to-pressure ratios of α_MRI = 0.1 and α_DZ = 0.001. Contours of the gas and dust density are shown for 10⁻⁹ and 10⁻¹² g/cm³ (yellow solid line). The green solid line shows the optical depth line τ = 2∕3 for the starlight irradiation. The white solid line shows the water snow line in the disk. The white circle shows the location of the pebble trap.