Opacity for realistic 3D MHD simulations of cool stellar atmospheres A. Perdomo García, N. Vitas, E. Khomenko, M. Collados, C. Allende Prieto, I. Hubeny and Y. Osorio A&A, 675 (2023) A160 Published online: 18 July 2023 DOI: 10.1051/0004-6361/202346341