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tokens: Acknowledgments DK and DP thank the Institut Lagrange de Paris, a LABEX funded by the ANR (under reference ANR-10-LABX-63) within the Investissements d'Avenir programme under reference ANR-11-IDEX-0004-02, where this work was started. AL acknowledges the NSF grant AST 1212096 and Center for Magnetic Self Organization (CMSO). He also acknowledges Institut D'Astrophysique de Paris and Institut Lagrange de Paris for hospitality during his visit.