COM abundance profiles with respect to H₂ (f. C¹⁸O = derived from C¹⁸O 1–0 emission) to the south (S) and to the west (W) based on data from observational setups 1–3 (encircled symbols) and 4–5. Panels a–d: original COM abundances. Panels e–h: abundances normalised to the value at 1.5″ distance to Sgr B2 (N1). Unfilled symbols with arrows pointing downwards or upwards indicate upper or lower limits, respectively. Vertical dashed lines mark the distance from Sgr B2 (N1) beyond which the respective COM is no longer detected.