2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/11881A single merger scenario for making galaxies such as NGC 4550 possessing equal coplanar counter-rotating stellar disks is investigated by collisionless N-body technique. The scenario is successful in producing an axisymmetric disk made of two almost equal counter-rotating populations. The final disk shows a clear bimodal line profile in the outer part, which demonstrates that disk-disk mergers do not always produce ellipticals.4 pages, 2 figures, Contribution to IAU Symposium 186 "Galaxy Interactions", in pressAstrophysicstext