Upper panel: spatial distribution of cluster members selected as M-type PMS stars in Sect. 7.2.2, plotted as a two-dimensional histogram smoothed with a Gaussian kernel. The density scale is the number of stars per bin and per arcmin². Overplotted black crosses are candidate members selected with classical methods. Lower panel: spatial distribution of cluster members selected with classical methods, plotted as a smoothed two-dimensional histogram. Overplotted black crosses are cluster members selected as M-type PMS stars.