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tokens: ACKNOWLEDGEMENTS We gratefully acknowledge the anonymous referee for useful comments and suggestions. We also thank E. Bonnasieux, who carefully read the manuscript, helping us to improve it. FL and AB acknowledge financial support from the Italian Minister for Research and Education (MIUR), project FARE SMS, code R16RMPN87T. AB acknowledges financial support from the ERC-Stg DRANOEL, no 714245. IP acknowledges funding from the INAF PRIN-SKA 2017 project 1.05.01.88.04 (FORECaST). IP, FL and MM acknowledge support from INAF under the MAIN STREAM PRIN project ‘SAUROS’. The TRG computer cluster was funded by the Autonomous Region of Sardinia (RAS) using resources from the Regional Law 7 August 2007 n. 7 (year 2015) ‘Highly qualified human capital’, in the context of the research project CRP 18 ‘General relativity tests with the Sardinia Radio Telescope’ (P.I. of the project: Dr. Marta Burgay).