Observed data of Orion KL and Sgr B2 taken with the ALMA interferometer and the IRAM 30 m telescope, respectively (histogram black spectrum), together with the synthetic spectra obtained using the column densities given as upper limits in Table 6 (red and blue thin curves). The synthetic total model for the 30 m data of Sgr B2(N) (see Belloche et al. 2013) is overlaid in green. A v_LSR of +9.0 km s⁻¹ and +64.0 km s⁻¹ is assumed for Orion KL and Sgr B2, respectively.