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tokens: GA, RE, JMG, JFG, and JMT acknowledge support from MINECO (Spain) AYA2014-57369-C3 grant (co-funded with FEDER funds). JMG also acknowledges support from the MECD PRX15/00435 grant (Spain) and from the SI CGPS award, ‘Magnetic Fields and Massive Star Formation’. RE also acknowledges MDM-2014-0369 of ICCUB (Unidad de Excelencia ‘María de Maeztu’). SC acknowledges the support of DGAPA, UNAM, and CONACyT (Mexico).