Journal article published in 2018 by Gravity Collaboration, Martina Karl, Oliver Pfuhl, Frank Eisenhauer, Reinhard Genzel, Rebekka Grellmann, Maryam Habibi, Roberto Abuter, Matteo Accardo, António Amorim, Narsireddy Anugu, Gerardo Ávila, Myriam Benisty, Jean-Philippe Berger, Nicolas Blind and other authors. Gravity Collaboration, Martina Karl, Oliver Pfuhl, Frank Eisenhauer, Reinhard Genzel, Rebekka Grellmann, Maryam Habibi, Roberto Abuter, Matteo Accardo, António Amorim, Narsireddy Anugu, Gerardo Ávila, Myriam Benisty, Jean-Philippe Berger, Nicolas Blind, Henri Bonnet, Pierre Bourget, Wolfgang Brandner, Roland Brast, Alexander Buron, Alessio Caratti O. Garatti , Frédéric Chapron, Yann Clénet, Claude Collin, Vincent Coudé Du Foresto, Willem-Jan de Wit, Tim de Zeeuw, Casey Deen, Françoise Delplancke-Ströbele, Roderick Dembet, Frédéric Derie, Jason Dexter, Gilles Duvert, Monica Ebert, Andreas Eckart, Michael Esselborn, Pierre Fédou, Gert Finger, Paulo Garcia, Cesar Enrique Garcia Dabo, Rebeca Garcia Lopez, Feng Gao, Éric Gendron, Stefan Gillessen, Frédéric Gonté, Paulo Gordo, Ulrich Grözinger, Patricia Guajardo, Sylvain Guieu, Pierre Haguenauer, Oliver Hans, Xavier Haubois, Marcus Haug, Frank Haußmann, Thomas Henning, Stefan Hippler, Matthew Horrobin, Armin Huber, Zoltan Hubert, Norbert Hubin, Gerd Jakob, Lieselotte Jochum, Laurent Jocou, Andreas Kaufer, Stefan Kellner, Sarah Kendrew, Lothar Kern, Pierre Kervella, Mario Kiekebusch, Ralf Klein, Rainer Köhler, Johan Kolb, Martin Kulas, Sylvestre Lacour, Vincent Lapeyrère, Bernard Lazareff, Jean-Baptiste Le Bouquin, Pierre Léna, Rainer Lenzen, Samuel Lévêque, Chien-Cheng Lin, Magdalena Lippa, Yves Magnard, Leander Mehrgan, Antoine Mérand, Thibaut Moulin, Eric Müller, Friedrich Müller, Udo Neumann, Sylvain Oberti, Thomas Ott, Laurent Pallanca, Johana Pand uro, Luca Pasquini, Thibaut Paumard, Isabelle Percheron, Karine Perraut, Guy Perrin, Andreas Pflüger, Thanh Phan Duc, Philipp M. Plewa, Dan Popovic, Sebastian Rabien, Andrés Ramı́rez, Jose Ramos, Christian Rau, Miguel Riquelme, Gustavo Rodr\ǵuez-Coira, Ralf-Rainer Rohloff, Alejandra Rosales, Gérard Rousset, Joel Sanchez-Bermudez, Silvia Scheithauer, Markus Schöller, Nicolas Schuhler, Jason Spyromilio, Odele Straub, Christian Straubmeier, Eckhard Sturm, Marcos Suarez, Konrad R.~W Tristram, Noel Ventura, Frédéric Vincent, Idel Waisberg, Imke Wank, Felix Widmann, Ekkehard Wieprecht, Michael Wiest, Erich Wiezorrek, Markus Wittkowski, Julien Woillez, Burkhard Wolff, Senol Yazici, Denis Ziegler, Gérard Zins

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