Asymmetry index as a function of radius for all galaxies (A_rad). Upper panel: asymmetry profiles for all galaxies (grey). The black solid and dashed lines indicate the median and mean values, respectively, of asymmetry at fixed factors of Petrosian radius. Lower panel: asymmetry profiles split between Fornax main (blue) and Fornax group (orange). The coloured solid lines show the median values of asymmetry at a given factor of the Petrosian radius.