Spatial morphology of dense gas around the most massive star (star symbol) in G023.01−00.41: moment-zero map of the CH₃OH (14_1,13–14_0,14) A⁺ emission (colours). The upper wedge quantifies the line intensity from its peak to the maximum negative in the map; black contours are drawn at levels of 10, 50, and 100 times the 1 σ rms of 2.8 mJy beam⁻¹ km s⁻¹. The disk plane, with white ticks at steps of 500 au, is drawn from the central star position at a position angle of − 33° (see Sect. 3). The synthesised ALMA beam is shown in the bottom left corner. White empty circles mark areas (hereafter, ‘pointings’) where the CH₃CN spectra of Figs. A.3 and A.4 are integrated and are labelled from 1 to 22 (cf. Col. 1 of Table 2).