Multiple star systems in the Orion nebula GRAVITY collaboration, Martina Karl, Oliver Pfuhl, Frank Eisenhauer, Reinhard Genzel, Rebekka Grellmann, Maryam Habibi, Roberto Abuter, Matteo Accardo, António Amorim et al. (125 more) A&A, 620 (2018) A116 Published online: 07 December 2018 DOI: 10.1051/0004-6361/201833575