Ellipticity (e) of 29 Galactic GCs obtained using the robust PCA method against the relaxation time at the half-mass radius, log t_h, from Harris (1996). The points are coloured according to the last crossing time through the Galactic disc, log t_c, taken from Pancino et al. (2024). The name of each cluster is indicated close to the corresponding point. Both times are given in years. Dynamically young clusters tend to be more elliptical.