Channel maps of the ²⁸SiO v = 1 J = 5–4 line emission. The white contours are at 4, 8, 16, 32, 64 and 128 times the rms noise in the peak line channel (0.29 Jy beam^-1). Every channel is 2.5 km s^-1 wide and the central LSR velocity is indicated in the lower right corner of each box. The two narrow emission features in the spectral profile at around 0 km s^-1 and 12 km s^-1 are clearly evident in the channel maps. The emission from the v = 1 ²⁸SiO line in the central channel maps is unresolved and centered at Source I (marked with a white star in each channel). The more diffuse emission at velocities  > 25 km s^-1 instead does not peak at the position of Source I and is likely associated with CH₃OCHO. The ALMA synthesized beam is indicated as a white ellipse in the lower left panel.