Disk properties for two cases with T_infall = 100 kyr but different initial viscosities: α₀ = 0.01 (a) and α₀ = 0.1 (b). Both cases are shown at 1000 yr after disk formation. The top panels (a₁ and b₁) show the gas surface density (solid purple) and 100 times the dust surface density (solid green) as a function of distance to the star. The vertical dash lines show the centrifugal radius, R_C (grey), the condensation lines of refractories (purple) and silicates (green), and the sublimation line of water (yellow). The fine vertical black line shows the distance where the dust surface density has a value of 10⁻² g cm⁻². The middle panels (a₂ and b₂) show the dust size, and the bottom panels (a₃ and b₃) the radial dust speed. A positive radial velocity represents motion away from the star, while a negative velocity is towards the star. Both of the shown simulations assume the nominal fragmentation thresholds of 1 m s⁻¹ and 10 m s⁻¹ for dry and icy particles, respectively.