Individual spectra for each observed position as a function of the LSR velocity. The orange lines show the N₂H⁺ (1-0) spectrum, while the blue lines show the HCN (1-0) emission divided by a factor of 5. The vertical dashed lines delimit the windows used to reduce the data and derive the spectral line parameters. N₂H⁺ (1-0) shows good agreement with the mean HCN LSR velocity. Table 2 reports the derived spectral line parameters.