EMoCA absorption spectra of four isotopologues of CS towards four positions in Sgr B2(N). The offsets (in units of arcseconds, see Table 4 and Fig. 1) from the phase centre are indicated at the right of each row. The observed spectra are shown in black and the synthetic spectra in magenta, purple, green, and blue, depending on the position. The synthetic spectra were obtained by Thiel (2019). The dotted vertical lines indicate the velocities atwhich we determined the isotopic ratios using the corresponding isotopologue. The velocities are listed in Table 4. The grey horizontal lines show the continuum level.
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