Channel maps of H₂CO 3_1,2 − 2_1,1 and CS 5−4 emission towards DG Tau. The blue and red contours show the emission at symmetric blue- and redshifted velocities with respect to systemic velocity (V_sys = +6.24 km s⁻¹) up to V_LSR − V_sys = ±3 km s⁻¹, as labeled in the upper left corner of each channel box. The H₂CO 3_1,2 − 2_1,1 and CS 5−4 lines are observed in the narrow (0.162 km s⁻¹ per channel) and broad (0.6 km s⁻¹ per channel) spectral window, respectively. First contour and step are 3σ. 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.