Peak position of N₂H⁺ (left) and HCO⁺ (right) versus luminosity for the disk, envelope and outflow cavity conditions of the fiducial models. The different colors indicate inclination. These curves are combined into the black curve shown in Figures 8 to 14. We note that the peak position of N₂H⁺ does not show a clear trend with inclination, while the peak position of HCO⁺ decreases with increasing highlighting the importance of inclination in measuring an accurate water snowline location.