Channel maps of the CH₃OH (10_2,8–9_3,7) A⁺ line emission (colours) observed at 700 au resolution with ALMA (synthesized beam in white). Each map is labelled by its central velocity (V_LSR). The brightness scale of the line emission is quantified by the wedge on the top left panel. The reference system and symbols in each channel map are the same as those used in Fig. 1. For comparison, the white contour corresponds to the dotted black contour of Fig. 1.