The morphing of decay powered to interaction powered Type II supernova ejecta at nebular times Luc Dessart, Claudia P. Gutiérrez, Hanindyo Kuncarayakti, Ori D. Fox and Alexei V. Filippenko A&A, 675 (2023) A33 Published online: 29 June 2023 DOI: 10.1051/0004-6361/202345969