Fig. B.5
Observational spectra (in black) of the ground state CH3CN J = 12−11 transition towards the cores located in the central region of Sgr B2(M). The continuum level for core M-SMA-1a is about 60 K, for core M-SMA-1b about 150 K, and for the remaining cores about 100 K. A number of absorption and emission spectral linefeatures are visible in all the spectra.
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