Image of the HI emission in the very centre, avoiding  ± 100 km s^-1 around the systemic velocity of  − 310 km s^-1. This cut has been made to subtract the large-scale HI emission seen in projection superposed to the centre, expected near the systemic velocity. The contours are the dust emission from Spitzer-IRAC (8 μm image where a scaled version of the 3.6 μm image has been subtracted to remove the stellar photospheres emission) (Block et al. 2006). The HI cube is from Braun et al (2009).