Channel maps of the CO (2-1) emission with V_LSR velocity from −3 to +12.6 km s⁻¹. The beam size is $0_{\cdot }^{\mathrm{\prime }\mathrm{\prime }}31$×$0_{\cdot }^{\mathrm{\prime }\mathrm{\prime }}26$ (PA=−3°), corresponding to a spatial resolution of about 40 au at the distance of HL Tau (147.3 pc). In all the panels the disk position is indicated by the magenta contours of the continuum emission at 1.3 mm, drawn at [10, 200, 700]σ_c. The white line indicates the direction of the disk minor axis (PA=48°).