tokens: The authors are grateful to the anonymous referee for constructive comments. The authors thank Doug Gilliam (NSO) and Michiel Van Noort (MPS) for their valuable support during the acquisition and MOMFBD processing of the data. S.L.G. and F.Z. are supported by Università degli Studi di Catania (Linea di intervento 1 e Linea di intervento 2). The research leading to these results has received funding from the European Research Council under the European Union’s Horizon 2020 Framework Programme for Research and Innovation, grant agreements H2020 PRE-EST (No. 739500) and H2020 SOLARNET (No. 824135). This work was also supported by INAF Istituto Nazionale di Astrofisica (PRIN-INAF-2014). S.J. acknowledges support from the European Research Council under the European Unions Horizon 2020 research and innovation program (grant agreement No. 682462) and from the Research Council of Norway through sits Centres of Excellence scheme (project No. 262622).
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