From left to right, top to bottom panels: emission lines of H15NC, HN13C, HC15N, and hyperfine transitions of H13CN observed with IRAM 30 m towards IRDCs C, F, G, and H. Red lines indicate the best Gaussian fit to the lines. 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 using a single-Gaussian component profile (see red line in bottom panels and Sect. 3.1 for details). See also Figs. A.1−A.4 for all spectra taken.
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