Observed data of Sgr B2 taken with the IRAM 30 m telescope (histogram black spectrum) together with the synthetic spectra obtained using the column density given as upper limit in Table 3 (thin red curve). The synthetic total model for the 30 m data of Sgr B2(N) (see Belloche et al. 2013) is overlaid in green. A νLSR of +64.0 km s−1 is assumed.
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