Velocity-integrated line intensities in [K km s⁻¹] of C¹⁷O (1-0), (2-1) and (3-2). Each of the maps shown was generated using a signal-to-noise-ratio cutoff of 3. The studied SSC regions as listed in Table 4 are labelled in white text on the map. The original SSC locations with appropriate beam sizes from Leroy et al. (2018) are shown by the red regions. The ALCHEMI 1″.6 × 1″.6 beam is displayed in the lower-left corner of the map.