Supplement 1: Space-borne frequency comb metrology
M. Lezius, Tobias Wilken, Christian Deutsch, Michele Giunta, Olaf Mandel, A. Thaller, Vladimir Schkolnik, Max Schiemangk, Aline N. Dinkelaker, Anja Kohfeldt, Andreas Wicht, Markus Krutzik, Achim Peters, Ortwin Hellmig, Hannes Duncker, K. Sengstock, Patrick Windpassinger, Kai Lampmann, Thomas Hülsing, Theodor W. Hänsch, R. Holzwarth