Radial profiles obtained along four different orientations with PA of 6°, 16°, 30° and 55° (shown in Fig. 9, right panel) at the top, top-centre, bottom-centre and bottom panels, respectively. The horizontal green stripe represents the Green Valley in SDSS g - r (see Sect. 4.3. The bulge, disc and pseudo-ring limits are measured at 26.8 mag arcsec⁻². The bulge limit (2.5 kpc) and the disc limit are shown as the light blue dashed and black dotted lines, respectively. The pseudo-ring variable inner and outer limits are defined in each panel by the green dot-dashed lines. The light cyan band in the PA = 30° panel sets the location of the optical feature to the S marked as a cyan arrow in the left panel of Fig. 9 and a magenta ellipse in Fig. 13.