Panel a: surface brightness profiles along slits, parallel to the x-axis of Fig. 4a. The black line crosses the centre of the galaxy, while the rest of them, from top to bottom, were taken 314, 69, and 10″above (red lines) and below (blue lines) it. Panel b: unsharped masked image of the galaxy. Characteristic distances from the galactic centre are indicated in both panels with dashed perpendicular lines, which correspond to morphological features discussed in the text.