Robustness of N₂H⁺ and DCO⁺ as CO snowline location tracers. Integrated intensity maps of the simulated line emission show CO (top row), DCO⁺ (second row) and N₂H⁺ (third row) emission. Contours in all three rows are for CO at 10, 30, 50, and 100 mJy beam⁻¹ km s⁻¹. Images that have been scaled for better comparison have the scaling factor noted on the top right corner. Different inclinations are shown in order to determine if inclination affects the robustness of N₂H⁺ and DCO⁺ as snowline position tracers. 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.