Distribution of member stars (large circles) projected on the tangent plane passing through the galaxy centre (left), and on the proper motion (middle) and colour-magnitude plane (right), for systems in the regime of > 500 stars with P > 0.95, in increasing order of distance from top to bottom. The galaxy names are indicated in the figure titles. The colour-coding indicates the probability of membership (only when above > 0.5; the stars with P < 0.5 are shown as grey dots. The ellipses in the left panel have semi-major axes equal to 1× and 3× the half-light radii in Table 1 (apart from M33, that is missing this quantity, for which we consider 0.5 deg), and ellipticity and position angle taken from the same table.