Third-degree polynomial fit to the geometry of the wall (red line) shown in the disk dust density plot (blue region), for various z_big values. The disk parameters are ﹩\dot{M}=1\times 1{0}^{-8}\,{M}_{\odot }\,{{\rm{yr}}}^{-1}﹩ and ϵ = 0.01, for a 0.5 M_⊙, 1 Myr old star. The thick black dashed line is the location of a vertical wall with T_sub = 1400 K, while in orange we show the scale height at different values, as indicated by the labels.