Ensemble X-ray variability of optically selected QSOs: dependence on black hole mass and Eddington ratio - Georgakakis, A.; Buchner, J.; Ruiz, A.; Boller, T.; Akylas, A.; Paolillo, M.; Salvato, M.; Merloni, A.; Nandra, K.; Dwelly, T. (MNRAS submitted, arXiv:2401.17285, 2024)