Detection of Fe I and Fe II in the atmosphere of MASCARA-2b using a cross-correlation methodM. Stangret, N. Casasayas-Barris, E. Pallé, F. Yan, A. Sánchez-López and M. López-PuertasA&A, 638 (2020) A26DOI: https://doi.org/10.1051/0004-6361/202037541