Spectral fit to the HCN(1–0) and HCO⁺(1–0) line wings showing several spectrally resolved narrow substructures (here often indicated as clumps). The spectrum was extracted from the cleaned datacube before continuum subtraction and using a beam-size aperture centred at RA(J2000) = 12:56:14.216 and Dec(J2000) = 56:52:25.186. The rms is 1.8 mJy per δv = 6.9 km s⁻¹ spectral channel. The clump solutions that were simultaneously fitted to both transitions are plotted in magenta, and features detected only in HCN (HCO⁺) are shown in cyan (orange). The best-fit Gaussian parameters are reported in Table 3.