Extracted spectra from the regions marked in Figs. 10 and 11. The thick lines show the fitted profile of the spectra. Gaussian fittings were performed for CH₃OH spectra and C₂H(N = 1–0) spectra at positions A and C with two velocity components. The spectrum of C₂H(N = 1–0) at position B is fit with one velocity component. Single velocity component hyperfine structure profile fittings are done for all NH₃(1, 1) spectra and N₂H⁺(1–0) spectra except the one from position C, in which the thick green line shows the two velocity component fitting and the thin line red shows the one component fitting.The velocity of N₂H⁺(1–0) spectra is offset by ~8 km s^-1 because the rest frequency was set at the frequency of the isolated hyperfine component (F₁,F = 0,1 → 1,2). The results from the fittings are listed in Table 8.