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Fig. A.1

image

Spectra of HC15N, HN13C, H15NC, and H13CN observed with IRAM 30 m towards IRDC C. The red line indicates the best Gaussian fit. The hyperfine components of H13CN were initially fitted but given the bad results of the fit, in a second step only the main F = 2 → 1 component of H13CN was fitted with a single-Gaussian component profile (see red line in bottom panels and Sect. 3.1 for details).

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