Channel maps of C¹⁸O (top), C¹⁷O (second row), CS (third row), C³⁴S (forth row) and N₂H⁺ (bottom). The maps of C¹⁸O and N₂ H⁺ are smoothed with a Gaussian kernel of FWHM = 5′′, and C¹⁷O and C³⁴S with FWHM = 25′′. For N₂ H⁺, the hyperfine components were fitted assuming the LTE line ratios, and only the isolated component is shown here. For C¹⁷O, the target line (F = 3/2–5/2) is blended with the F = 7/2–5/2 component, but the F = 5/2–5/2 one is visible, shifted by v_lsr = − 3.3 km s⁻¹.