tokens: Acknowledgements We thank C. Mason and T. Yuan for providing their data and models. This work made use of I mfit and B arolo softwares. EMDT acknowledges the support of the Australian Research Council through grant DP160100723. CG acknowledges support by VILLUM FONDEN Young Investigator Programme through grant no. 10123. FF acknowledges hospitality at the European Southern Observatory in Garching as a scientific visitor. AM, PR, GBC and ML acknowledge financial support from PRIN-INAF 2014 1.05.01.94.02.
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