Channel maps of CN 2−1 emission towards DG Tau. The channel velocity, V_LSR, is relative to the brightest CN 2−1, J = 5/2–3/2, F = 7/2–3/2 hyperfine component and is labeled in the upper left corner of each channel box. The other two hyperfine components are offset by − 1.47 and + 0.78 km s⁻¹ with respect to the brightest one (see Table 1). The channels corresponding to the systemic velocity for the three hyperfine components (i.e. 6.21, 4.75, and 7.02 km s⁻¹) are highlighted by a thick red box. First contour and step are 3σ, negative intensities are shown by dashed contours. The black star and contour indicates the peak and the 5σ level of the 1.3 mm continuum. The ellipse in the bottom right corner of the last channel shows the ALMA synthesized beam.