Cartoon showing the scales relevant to the different processes involved in AGN feedback in the nucleus of M 51. The striped areas delinate the main elements of the radio plasma jet (synchrotron emission); the nuclear collimated jet was resolved by Crane & van der Hulst (1992), and the rest of the structures have been identified on the maps from Dumas et al. (2011). The left panel corresponds to a face-on view, whereas the right panel shows a possible edge-on deprojection.