Projected phase spaces of the three galaxy systems (GrG1, GrG2, and GrG3 in the top, middle, and bottom panels, respectively). For each system, the rest-frame velocity, V_rf, and the distance R have been computed using the group mean velocity and group center. Circles indicate galaxies that belong to the velocity peak. Full circles indicate the group members (black, green and red colors for GrG1, GrG2 and GrG3, respectively). Middle panel also shows the galaxies of a secondary peak (GrG2bis, yellow color). For each group, the vertical line shows the R₂₀₀ radius and the mean redshift of the system is given (see also Table 8).