Atomic oxygen abundance toward Sagittarius B2Dariusz C. Lis, Paul F. Goldsmith, Rolf Güsten, Peter Schilke, Helmut Wiesemeyer, Youngmin Seo and Michael W. WernerA&A, 669 (2023) L15DOI: https://doi.org/10.1051/0004-6361/202245481