Third-degree polynomial fit to the geometry of the wall (red solid thick line) shown in the disk temperature structure, 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 black line is the location of a vertical wall with T_sub = 1400 K. Dashed lines are temperature isocontours for 100, 300, 500, 1000, and 1400 K, from right to left.