Integrated intensity maps of a selected transition for each O-bearing COM. The top-right panel in each figure shows the spectra toward the center, and the filled regions indicate the integration range for the zero-order moment maps, which is 3.5–10.7 km s⁻¹ (except for CH₃OH, for which it is 3.5–12.0 km s⁻¹), for the zero-order moment maps. The blue contours in the top-left panel represent the ALMA 1.3 mm continuum emission (Tobin et al. 2018) with levels of [3, 5, 7, 10, 30, 70]σ. The horizontal gray line in the top-left panel shows the PV cut used in Fig. 7. The blue pixel in the top-right panel is the pixel used to extract the spectra in this work.