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Fig. 1.

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Observed lines of D13CCCN, DC13CCN, DCC13CN, and DCCC15N towards TMC-1 (CP) with the Yebes 40 m telescope (histogram black spectra). The red curves present the synthetic spectra obtained using LVG approximation (see Sect. 3.1 and Table A.5). The dashed line represents the 3σ level.

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