Upper panel: HST ACS F814W zoomed image of the central part of the bulge with intensity cuts chosen to make the stellar nucleus visible. The concentric circles provide the scale of the image and help the eye to appreciate that the nucleus resides at the centre of the bulge. Lower panel: surface brightness profile of the stellar nucleus in both the ACS bands. The continuous line displays the King (1966) model that fits the observed profiles. The parameters of the model are reported in the panels. The deviation from a smooth profile observed around log(R) = 0.75 is due to a relatively bright source projected onto the outskirts of the nucleus.