tokens: Acknowledgements We thank the IRAM staff for their support in carrying out the CALYPSO observations, and the anonymous referee for a detailed reading that significantly helped us to improve the paper. We thank Kees Dullemond, Ralf Klessen, Sandrine Bottinelli, Benoit Commercon, and Ralf Launhardt for their participation to the preparation of the CALYPSO project. We thank the INSU “Action Spécifique ALMA” for their financial support to the CALYPSO collaboration. This work has benefited from the support of the European Research Council under the European Union’s Seventh Framework Programme (Advanced Grant ORISTARS with grant agreement No. 291294 and Starting Grant MagneticYSOs with grant agreement No. 679937).
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