From left to right: radial profile of surface brightness in the HST I-band and V-band, in units of mag/arcsec²; V−I colour map of the same field of view shown before, 30′′ × 33′′, with large tickmarks indicating a separation of 5′′ (in linear scale from 1.0 to 1.6); blowup of the central area, where the “bump” is originating from (overlaid with Hα contours in white; the black contours correspond to the radio jet traced by 20 cm continuum).