Schematic of the four zELDA gas configurations used to model the Lyα profile (Section 3.2), with the observer located to the right in each panel. Gray regions indicate neutral gas, with darker shading denoting higher column density, and arrows indicate the radial outflow velocity ﹩{V}_{{\rm{\exp }}}﹩. Panels show (a) Thin_Shell, (b) Galactic_Wind, (c) Bicone_X_Slab_Out, and (d) Bicone_X_Slab_In. The two biconical models have the same gas geometry and differ only in viewing angle.