F606W filter images from ACS/HST of NGC 7733 (top) and NGC 7734 (bottom) are shown, along with the structure maps of the central regions for both galaxies. For NGC 7733, the structure map is zoomed in to cover the central 8 × 8 arcsec², revealing a visible central disc-like structure with a semi-major axis of 1.515 arcsec. At the distance of NGC 7733, 1 arcsec = 737 pc. In contrast, the structure map for NGC 7734 is zoomed in to cover the central 6 × 6 arcsec², showing a diffuse structure in the centre. The clump present along the bar of NGC 7734 is marked here and has been discussed in Sect. 4.3. At the distance of NGC 7734, 1 arcsec = 766 pc. North is up, and east is to the left.