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tokens: We are grateful to the referee, Brent Groves, for very constructive comments that helped to improve the manuscript. We thank Stefanie Komossa (MPIfR), Pavel Kroupa (University of Bonn), Thomas Krichbaum (MPIfR), Madeleine Yttergren (University of Cologne), Bozena Czerny (CFT PAN), Mary Loli Martinez-Aldama (CFT PAN), and Swayamtrupta Panda (CFT PAN) for very helpful discussions and input. This work was done with the financial support of SFB956 – “Conditions and Impact of Star Formation: Astrophysics, Instrumentation and Laboratory Research” at the Universities of Cologne and Bonn and MPIfR, in which M.Z., G.B., A.E., N.F., S.B., J.-A.Z., K.H. are members of sub-group A2 – “Conditions for Star Formation in Nearby AGN and QSO Hosts” and A1 – “Understanding Galaxy Assembly”, with M.V. and L.F. being its former members. Michal Zajaček acknowledges the financial support by National Science Centre, Poland, grant No. 2017/26/A/ST9/00756 (Maestro 9).