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tokens: ACKNOWLEDGEMENTS The authors would like to thank the anonymous referee for extremely valuable comments and suggestions. A special thank goes to Kristoffer Stensbo–Smidt for all the work and the precious suggestions he put in reviewing and commenting this work. MB acknowledges the INAF PRIN-SKA 2017 program 1.05.01.88.04 and the funding from MIUR Premiale 2016: MITIC . GL and MDV acknowledge the UE funded Marie Curie ITN SUNDIAL that partially supported this work. SC acknowledges support from the project ‘ Quasars at high redshift: physics and Cosmology ’ financed by the ASI/INAF agreement 2017-14-H.0. Topcat has been used for this work (Taylor 2005 ). C 3 has been used for catalogue cross-matching (Riccio et al. 2017 ). DAMEWARE has been used for ML experiments (Brescia et al. 2014a ).