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tokens: ACKNOWLEDGEMENTS We thank the anonymous referee for the useful report which helped to improve the quality of the paper. We acknowledge Gerrit Schellenberger for the help and fruitful discussion. LL and THR acknowledge support from the German Research Association (DFG) through the Transregional Collaborative Research Centre TRR33 ‘The Dark Universe” (project B18) and support from the German Aerospace Agency (DLR) with funds from the Ministry of Economy and Technology (BMWi) through grant 50 OR 1514. LL also acknowledges support from NASA through contract NNX17AD83G.