Dust-to-gas ratio versus relative height (z/r) in the mid-infrared emitting region of the T Tauri star at 10 AU using the self-consistent settling (top) and the midplane settling approach (bottom) with the same gas density distribution. The black solid line represents the total dust-to-gas ratio, the gray lines denote the individual contributions of grains of different sizes, from 0.02 micron (dotted) to 6 mm (solid). The dotted line represents a fully mixed disk, with a dust-to-gas ratio of 0.01. The radial τ = 1 surface in the optical is located at a relative height of approximately 0.16 and 0.2.