3.6 μm image of ESO 533-4 from the S⁴G. The red cross indicates the centre of the galaxy and the region with a green border is that we studied. North is up and east is left. The white solid lines perpendicular to the galaxy mid-plane show the four axial bins used for the luminosity profile fits in Fig. 2. The dash-dotted lines indicate the heights over which the profiles were fit. The solid lines parallel to the galaxy mid-plane correspond to the height above which 90% of the light comes from the thick disc. The numbers are used to associate the bins with the fits in Fig. 2.