Fits of the King profile according to Eq. (5) for the observed radial density profiles, based on the confident members of the clusters. The curves present distributions including the residual background stars (black dots on the yellow lines), the distributions corrected for the background (circles with statistical error bars), and the fitted King profiles (solid red curves). The vertical dashed lines show the core and tidal radii (r_c and r_t). The colour bands show errors in the radii.