New red giants in NGC 6791 and NGC 6819 using Kepler superstamps A. Covelo-Paz, N. Themeßl, F. Espinoza-Rojas and S. Hekker A&A, 679 (2023) A134 Published online: 29 November 2023 DOI: 10.1051/0004-6361/202347211