ΔV versus heliocentric distance of young SMC clusters located in the northeastern shell region. The solid and dashed vertical lines represent the galaxy center and its depth according to the cluster rotation disk (Piatti 2021b), while the horizontal line represents a boundary between bound and kinematically perturbed clusters. Magenta and red filled circles represent the present studied clusters and those taken from the literature, respectively. A kinematic gradient is present when compared to a young stellar model (middle panel), but absent in comparison to the old stellar and cluster models (right and left panels), respectively (see text for details).