Three-color composite image of Sgr B2(N). The green image shows the continuum emission at 242 GHz (Paper II), the red image corresponds to the molecular species CH₃ OCHO, and the blue image to C₂H₅CN. The center, which is dominated by the continuum and CH3OCHO emission, appears yellow. The images of the molecular species have been constructed from stacked cubes (see more details in Sect. 3 and Appendix A) and correspond to peak intensity maps. The continuum emission and species like CH₃ OCHO trace a filamentary structure, while species such as C₂H₅CN show a spherical or bubble-like shape. The white circle indicates the position of the central core with coordinates α(J2000) = 17^h47^m19^s.87, δ(J2000) = −28°22′18.′′43.