Ionization of heavy elements and the adiabatic exponent in the solar plasma V. A. Baturin, A. V. Oreshina, W. Däppen, S. V. Ayukov, A. B. Gorshkov, V. K. Gryaznov and I. L. Iosilevskiy A&A, 660 (2022) A125 Published online: 29 April 2022 DOI: 10.1051/0004-6361/202141873