First detection of AlF line emission towards M-type AGB stars M. Saberi, T. Khouri, L. Velilla-Prieto, J. P. Fonfría, W. H. T. Vlemmings and S. Wedemeyer A&A, 663 (2022) A54 Published online: 13 July 2022 DOI: 10.1051/0004-6361/202141704