Upper panel. Positions in the sky of the galaxies belonging to the Centaurus A/M 83 complex (from Karachentsev et al. 2007). Red symbols indicate early-type dwarfs (dwarf ellipticals, dE, and dwarf spheroidals, dSph), while blue symbols are for late-type dwarfs (dIrr). The circles are objects with positive tidal index, while the crosses stand for objects with negative tidal index. Two red stars are drawn at the positions of the two dominant giant galaxies CenA and M 83, around which the smaller companions are clustering, forming two distinct subgroups. The filled circles and thick crosses represent the dwarfs studied here. Lower panel. Same as above, just zoomed-in for a smaller region around M 83, where the galaxies studied here are located (as labeled in the plot).