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tokens: Acknowledgements We thank the anonymous referee for insightful comments and suggestions. We thank Vincent van Eylen and Subo Dong for useful discussions. This work was supported by the Netherlands Research Council NWO [grant #621.016.701 (LGM2)] and by the Netherlands Research School for Astronomy (NOVA). This research was supported by the Interuniversity Attraction Poles Programme (initiated by the Belgian Science Policy Office, IAP P7/08 CHARM) and by the European Union's Horizon 2020 research and innovation programme under grant agreement no. 671564 (COMPAT project).