Line ratios for the different pairs of H₂CO transitions. The left panels show the RADEX calculations, with the colour map indicating the various ratios. The white contours indicate the values of 0.3, 0.5, and 0.7, whereas the red contour indicates the disk integrated ratio from van der Marel et al. (2021). The panels in the second column indicate the ratios derived for the pixels where both transitions are detected, using the colour scheme as for the left panels. The final two columns display the derived temperatures for gas densities of $n_{{\text{H}}_2}={10}^7{\text{cm}}^{-3}$ (representative of the disk’s atmosphere, z/r ≳0.2) and 10⁸ cm⁻³ (representative of the disk’s midplane). The white solid, dashed, and dotted contours indicate temperatures of 200 K, 300 K, and 400 K, respectively.