Effect of disk geometry parameters on the CO snowline location. Molecular distributions are shown in the top four rows. The fifth row shows the maps of the integrated intensity of the simulated line emission for N₂H⁺ 1−0. The sixth row shows the corresponding slice extracted along z = 0 from the N₂H⁺ simulated emission maps. The average distance of the peaks from the center (i.e., peak radius) is indicated in AU in the top left corner. These positions are shown with orange vertical lines. The first and third columns show the fiducial models without and with disk, respectively. The additional columns show the effect of changing disk radius (second column), disk mass (fourth column), scale height H₀ (fifth column), and disk density (sixth column). Fractional abundances of all molecular species are relative to total number density of H₂ (top row). The black and gray contours show gas temperature and density, respectively. The emission maps are shown at i = 45° and convolved to a beam of 2″.