A major asymmetric ice trap in a planet-forming disk - I. Formaldehyde and methanol Nienke van der Marel, Alice S. Booth, Margot Leemker, Ewine F. van Dishoeck and Satoshi Ohashi A&A, 651 (2021) L5 Published online: 09 July 2021 DOI: 10.1051/0004-6361/202141051