Surface density (left) and midplane solid-to-gas ratio (right) for the case of α_acc = 10⁻², α_tur = 10⁻³, F_p/g = 0.3 and K = 0. In each panel, solid, dashed and dotted lines represent the cases of different accretion rate of the gas as Ṁ_gas = 3 × 10⁻⁸M_sun yr⁻¹, Ṁ_gas = 1 × 10⁻⁸M_sun yr⁻¹ and Ṁ_gas = 3 × 10⁻⁹M_sun yr⁻¹, respectively. In the left panel, blue, brown and green lines represent those of ice in pebbles, silicate in pebbles and silicate grains, respectively. In the right panel, blue and green lines represent those of pebbles and silicate grains, respectively.