Complete dataset; the version masked for AGN activity and used in the analysis is provided in Appendix C. The left panel shows the ${\mathrm{R}}_{18}^{13}$ line ratio map, while the central panel presents the Σ_SFR map, limited to regions where the line ratio is significantly measured. In these maps, light grey points indicate non-detections (S/N ≤ 3 in both lines), intermediate grey denotes lower limits (S/N ≤ 3 in C¹⁸O), and dark grey indicates upper limits (S/N ≤ 3 in ¹³CO). Coloured points mark detections with S/N > 3 in both lines. The overlaid contours represent the 30 K km s⁻¹ level of ¹²CO(1−0) emission for reference. The right panel shows the PAWS environmental mask (Colombo et al. 2014b) over the SWAN FoV, where different colours denote distinct environments: the nuclear bar (blue), molecular ring (pink), northern spiral arm (orange), southern spiral arm (red), and interarm (green). Points with black outlines correspond to the significant detections shown in the other panels.