Top panel: N₂H⁺ (1–0) channel maps for the hyperfine F₁F = 01 → 12 (isolated line) toward AFGL 5142. Contour levels are  −2, 2, 4, 6, 8, 10, and 12 times the rms noise of the maps, 0.055 Jy   beam^-1. Bottom panel: N₂H⁺ (1–0) channel maps for the hyperfine F₁F = 21 → 11, 23 → 12, 22 → 11, and F₁F = 11 → 10, 12 → 12, and 10 → 11. Contour levels are  −4,  −2, 2, 4, 6, 8, 10, 12, and 14 times the rms of the map, 0.055 Jy   beam^-1. In all panels the cross marks the position of the 3.2 mm continuum source. The synthesized beam is shown in the bottom left corner. Velocities referres to the F₁F = 01 → 12 hyperfine with the systemic velocity v_LSR= −3 km s^-1.