COM column density profiles to the south (S) and west (W), where solid curves show the total column densities derived from the linear fit in the population diagrams using setups 1–3 for ¹³CH₃OH and NH₂CHO (encircled symbols) and setups 4-5 for the rest of the COMs. Dotted curves indicate column densities used during the radiative transfer modelling with Weeds. Additional crosses on the markers indicate positions for which the velocity offset changed from ≲2 to ~7 km s⁻¹. Isolated unfilled markers with arrows indicate upper limits. Vertical lines mark the distance from Sgr B2 (N1) beyond which a COM is no longer detected.