tokens: Acknowledgements This research is supported by the Agence Nationale de la Recherche (project BxB: ANR-17-CE31-0022). F.L. and F.B. acknowledge support from the European Research Council under the European Union’s Horizon 2020 Research Innovation Framework Programme (ERC grant agreement ERC-2016-ADG-742719). S.M. and S.Z. acknowledge support by the ERC InvariantClass 320959. This work was also supported by the Programme National “Physique et Chimie du Milieu Interstellaire” (PCMI) of CNRS/INSU with INC/INP co-funded by CEA and CNES. We gratefully acknowledge fruitful discussions with J.-F. Cardoso, K. Benabed, P. Lesaffre, B. Godard, A. Gusdorf, E. Falgarone, S. Prunet, and J. Neveu. We finally thank the anonymous referee, whose comments helped to significantly improve the manuscript.
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