Galaxies in the M12 list plotted in the Galactocentric Cartesian reference frame (small open circles). The dwarfs of the extended NGC 3109 association are plotted as large red filled circles (with labels); those belonging to the NGC 55 association are plotted as dark filled circles. The symbol corresponding to IC 3104 has also been labeled. The lines are the best-fit lines to the members of the extended NGC 3109 association (including Antlia). The wide concentric circles have radii of 1 Mpc and 2 Mpc.