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tokens: Acknowledgements We thank the referee for useful suggestions; Sebastian Hönig for many illuminating discussions; Claudio Ricci for careful reading and comments on the manuscript. MS acknowledges support by the Ministry of Education, Science and Technological Development of the Republic of Serbia through the projects Astrophysical Spectroscopy of Extragalactic Objects (176001) and Gravitation and the Large Scale Structure of the Universe (176003); by FONDECYT through grant no. 3140518; by the Center of Excellence in Astrophysics and Associated Technologies. This research made use of Astropy, a community-developed core python package for Astronomy (Astropy Collaboration et al. 2013 ). Based on European Southern Observatory (ESO) observing programmes 60.A-9629, 076.B-0599, 078.B-0255, 087.B-0746, 088.B-0159, 089.B-0070, 385.B-0896 and 386.B-0026.