Scattering surface estimation h_s using DRAGyS (orange cross), compared to the τ_s = 1 surface from the star (red curves) for different dust masses from M_d = 10⁻², 10⁻⁴, 10⁻⁶ and 10⁻⁷ M_⊙ for each ring (respectively between 60-90 au, 110-140 au, and 160-190 au). As in section 3.2, we add the dust density map in the background, and we overplot the input gas pressure scale height as a gray dashed curve. The ratio (τ_s = 1 surface / pressure scale height) is indicated in white for each ring.