Stellar radial density profile for M 67 members (black filled circles). The different templates are plotted in different colours (see text for details). Vertical grey lines mark the derived r_c and r_t for the King (short dashed lines) and Nuker (long dashed lines) templates and r_c for the EFF template (dot-dashed line). Small arrows in the bottom show previous cluster size determinations by Bonatto & Bica (2003), Davenport & Sandquist (2010), and Gao (2018) from left to right.