Directly tracing the vertical stratification of molecules in protoplanetary disks T. Paneque-Carreño, A. Miotello, E. F. van Dishoeck, B. Tabone, A. F. Izquierdo and S. Facchini A&A, 669 (2023) A126 Published online: 24 January 2023 DOI: 10.1051/0004-6361/202244428