tokens: Acknowledgements We thank the referee for their interesting and useful comments that helped improve the clarity of the paper. Based on observations made with ESO Telescopes at the La Silla Paranal Observatory. F.B. acknowledges financial support from INAF through the “Progetti Premiali” funding scheme of the Italian Ministry of Education, University, and Research and through the ASI-INAF contract 2015-019-R.O. A.Z. acknowledges support from Prof. Giuseppe Lodato during his Master thesis work.
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