The distance to the Serpens South cluster from H2O masers Gisela N. Ortiz-León, Sergio A. Dzib, Laurent Loinard, Yan Gong, Thushara Pillai and Adele Plunkett A&A, 673 (2023) L1 Published online: 27 April 2023 DOI: 10.1051/0004-6361/202346369