A neural network approach to determining photometric metallicities of M-type dwarf stars C. Duque-Arribas, H. M. Tabernero, D. Montes, J. A. Caballero and E. Galceran A&A, 698 (2025) L12 Published online: 03 June 2025 DOI: 10.1051/0004-6361/202554722