Integrated intensity maps of selected transitions detected in Sgr B2(N3). The contour levels start at 3σ (rms ~ 3 mJ/beam) and increase with a step of 3σ. In each map the blue ellipse shows the result of the 2D-Gaussian fit. The black cross represents the position of the hot core derived from Fig. 1 and the red cross marks the peak position derived from the fit. The black filled ellipse represents the synthesized beam. The upper level energy of each transition is indicated in temperature units in each panel.