12C/13C of Kepler giant stars: The missing piece of the mixing puzzle N. Lagarde, R. Minkevičiūtė, A. Drazdauskas, G. Tautvaišienė, C. Charbonnel, C. Reylé, A. Miglio, T. Kushwahaa and B. Bale A&A, 684 (2024) A70 Published online: 05 April 2024 DOI: 10.1051/0004-6361/202348336