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tokens: Acknowledgements This work is based on observations obtained at the Bernard Lyot Telescope (TBL, Pic du Midi, France) of the Midi-Pyrénées Observatory, which is operated by the Institut National des Sciences de l’Univers of the Centre National de la Recherche Scientifique of France. Also based on observations obtained at the Canada-France-Hawaii Telescope (CFHT), which is operated by the National Research Council of Canada, the Institut National des Sciences de l’Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii. O.K. acknowledges support by the Swedish Research Council (project 621-2014-5720), and the Swedish National Space Board (projects 185/14, 137/17). M.S. is supported by Natural Sciences and Engineering Research Council (NSERC) of Canada Postdoctoral Fellowship program.