B335 first-order moment of the ¹³CO (J = 2–1) line observed with ALMA. Top: moment of the red channels, with velocities higher than the systemic velocity, V _sys (color scale: 8.9–10.1 km s⁻¹). Middle: moment of all the channels (color scale: 7.4–9.2 km s⁻¹). Bottom: moment of the blue channels, with velocities lower than V _sys (color scale: 6.8–8.0 km s⁻¹). The (0, 0) position, marked with a plus sign, is the same as in Fig. 21. The synthesized beam is shown in the lower left corner of the middle panel.