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Fig. E.1.


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Top: Integrated spectra of CN, HCO+, HCN, N2H+, HNC, CCH, H13CO+, H2CO, and HC3N (with Gaussian fits, including hyperfine structure when needed, in red). The values indicate the fit results. Bottom: Corresponding radial-velocity diagram obtained after making Keplerian velocity correction and line stacking.

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