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tokens: This work is based on observations made with ESO telescopes at the La Silla Paranal Observatory under programs 74.C-0209(A), 75.C-0014(A) and 91.C-0768(A). We would like to thank the anonymous referee for their comments, Casey Deen for performing the CRIRES observations and reading the manuscript, Chris Koresko for providing Keck/NIRC photometry, Hongchi Wang for helpful analysis of NACO photometry, and Peter Abraham for helpful discussions. This research was funded under Deutsche Forschungsgemeinschaft (DFG) programme nos. WO 857/10-1 and WO 857/13-1. CFM gratefully acknowledges an ESA Research Fellowship. The Submillimeter Array is a joint project between the Smithsonian Astrophysical Observatory and the Academia Sinica Institute of Astronomy and Astrophysics and is funded by the Smithsonian Institution and the Academia Sinica.