Inferring chromospheric velocities in an M3.2 flare using He I 1083.0 nm and Ca II 854.2 nm C. Kuckein, M. Collados, A. Asensio Ramos, C. J. Díaz Baso, T. Felipe, C. Quintero Noda, L. Kleint, L. Fletcher and S. Matthews A&A, 699 (2025) A121 Published online: 04 July 2025 DOI: 10.1051/0004-6361/202554798