tokens: Acknowledgments EP acknowledges the Jeremiah Horrocks Institute of the University of Central Lancashire for the hospitality while this paper was in progress. EP was partially supported by Accademia Nazionale dei Lincei and Fondazione Ing. Aldo Gini. Additional support while the paper was completed was provided by the Italian Ministry for Education University and Research (MIUR). VPD was supported by STFC Consolidated grants no. ST/J001341/1 and no. ST/M000877/1. VPD acknowledges being a part of the network supported by the COST Action TD1403 Big Data Era in Sky and Earth Observation. DRC was supported by STFC Consolidated grant no. ST/J001341/1. EMC, EDB, LM and AP are supported by Padua University through grants 60A02-5857/13, 60A02-5833/14 and 60A02-4434/15 and BIRD 164402/16. The simulation was run at the DiRAC Shared Memory Processing system at the University of Cambridge, operated by the COSMOS Project at the Department of Applied Mathematics and Theoretical Physics on behalf of the STFC DiRAC HPC Facility ( www.dirac.ac.uk ). This equipment was funded by BIS National E-infrastructure capital grant ST/J005673/1, STFC capital grant ST/H008586/1 and STFC DiRAC Operations grant ST/K00333X/1. DiRAC is part of the National E-Infrastructure. EP would like to thank R. Ragazzoni for his support while this work was in progress.
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