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tokens: Acknowledgements We thank Brad Foley for his constructive review, which greatly helped to improve this paper. D.H. has been supported through the NWA StartImpuls and N.T. has been supported by the Helmholtz Association (project VH−NG−1017) and by the German research foundation (DFG) through the priority programs 1922 “Exploring the diversity of extrasolar planets” (TO 704/3-1) and 1883 “Building a habitable Earth” (TO 704/2-1).