Robustness of HCO⁺ as a H₂O snowline location tracer. Simulated emission maps show HCO⁺ (top row), p–H₂O (second row) and o–H₂O (third row) emission. Contours in all three rows are H₂O at 0.4, 0.6, 0.9, 1.6, 1.9, and 2.1 mJy beam⁻¹ km s⁻¹. Images that have been scaled for better comparison have the scaling factor on the top right corner. Different inclination are shown in order to determine if it affects the robustness of HCO⁺ as a snowline location tracer. Inclinations shown are from face-on (i = 0°) to edge-on (i = 90°). The first three columns show the fiducial model without disk, while the other three columns show the fiducial model with disk. Slices extracted along z = 0 from the simulated line emission maps are shown in the bottom row normalized to the peak of each profile.