Sphericization process of DM halos during their formation, according to their mass and the screening effect of MG models. The mass range of the DM halos detected in the numerical simulation is delimited by the red rectangle. The a-sphericization process affects DM halos around the critical mass depending on the present-day characteristic amplitude of the dimensionless scalar field f_R0 of each model (see Eq. (7)). These DM halos are indeed present for the fR6 numerical simulation, but not the fR4 numerical simulation.