Moment 0 maps of the ¹³CO (2–1) emission integrated over the different velocity ranges from the combined data obtained with the IRAM 30m, ACA, and ALMA observations. The integrated velocity ranges are high velocities of V_LSR = 3–4.7 and 8.5–12 km s⁻¹, medium velocities of V_LSR = 4.7–5.4 and 7.8–8.5 km s⁻¹, and low velocities of V_LSR = 5.4–7.1 and 7.1–7.8 km s⁻¹. Blue and red contours show the blue- and redshifted emission, respectively. Contour levels are from 5σ and increase in steps of a factor of two in panels a and b, and those are 20σ, 30σ, 40σ, and then in steps of 20σ in panel c. 1σ levels of the integrated blue- and redshifted emission are 6 and 7.4 mJy beam⁻¹ km s⁻¹ in panel a, 4.6 and 3.4 mJy beam⁻¹ km s⁻¹ in panel b, and 3.8 and 3.1 mJy beam⁻¹ km s⁻¹ in panel c. Crosses denote the position of HL Tau. Filled blue ellipses present the size of the synthesized beam. Green circles show the region where the primary beam response is 0.5.