Panel a: map of the ALMA 242 GHz continuum emission of Sgr B2(N). The white dots indicate the position of the continuum sources reported in Paper II. The green dashed lines trace the path of the filaments identified inthe molecular line data (see Sect. 3.1), while gray dashed lines trace tentative elongated structures not clearly confirmed in the molecular emission maps. The light-gray circles indicate H II regions (see De Pree et al. 2014, and Paper I). Panel b: peak intensity map of the bright, isolated transition of CH₃OCHO at 229.404 GHz. Panel c: peak intensity map of the bright H₂CS transition at 244.048 GHz. In all panels, the synthesized beam of 0.′′4 is shown in the bottom-left corner, and a spatial scale bar is shown in the bottom-right corner.