N₂H⁺(1−0) spectra around 50 km s^-1 toward mm2 and the four interface positions if1 to if4. The green lines show N₂H⁺ fits taking into account the whole hyperfine structure whereas the black lines show two- and one-component Gaussian fits to the isolated hyperfine structure line −8.0 km s^-1 from the central peak. Peak velocities and line widths the hyperfine structure fits if1 to if3 and of the Gaussian fits (corrected for the −8.0 km s^-1 offset) for mm2 and if4 are presented in Table 3.