Distribution of spectroscopically confirmed PN (blue filled dots) and PN candidates (open red circles) from EMMI imaging and the literature. The origin of the coordinate system is centred on NGC 5128, the elliptical isophotes have axis ratio b/a = 0.77 with position angle 35° and the innermost ellipse is drawn at 1 effective radius (1R_eff = 305′′ (Dufour et al. 1979), equivalent to 5.62 kpc); the size of the other ellipses is 3, 5, 7, 10 and 15.5 effective radii as indicated.