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Fig. 3


Observed data of Orion KL, Sgr B2, and B1-b taken with different instruments (histogram black spectrum) together with the synthetic spectra obtained using the column densities given as upper limits in Table 2 (thin red curve). The synthetic total model for the 30 m data of Sgr B2(N) (see Belloche et al. 2013) and Orion KL (see Cernicharo et al. 2016) is overlaid in green. A vLSR of +9.0 km s-1, +64.0 km s-1, and +6.7 km s-1 is assumed for Orion KL, Sgr B2, and B1-b, respectively.

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