Position–velocity plot along a slice taken at PA = 108° of the H i disk. The emission is shown in black. The contour levels range between 1.7 mJy beam^-1and 7 mJy beam^-1, with steps of 1.4 mJy beam^-1. The absorption features are circled in blue and red, at the resolutions of 11′′ and 30′′. Contour levels are −2, −8 mJy beam^-1 and −1.7, −3.5 mJy beam^-1, respectively. The blue-shifted emission shows an external “plume” of the disk (in the NW of the total intensity map), at lower densities with respect to the regularly rotating ring.