Effect of binding energy on the CO snowline location. Molecular distributions are shown in the top four rows. The fifth row shows the intensity integrated simulated line emission maps 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 second, and fifth columns show the fiducial models without, and with disk, respectively, with E_b,CO = 1150 K and K. The column to the left of each fiducial model has K, while the right column has E_b,CO = 1307 K. 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 simulated line emission maps are shown at i = 45° and convolved to a beam of 2″.