tokens: We thank M. A. T. Groenewengen for the helpful comments. We acknowledge the support from the ERC Consolidator Grant funding scheme ( project STARKEY , G.A. n. 615604). A. B. acknowledges support from PRIN-MIUR 2017. T. S. R. acknowledges financial support from Premiale 2015 MITiC (PI B. Garilli). For the plots we used matplotlib, a Python library for publication quality graphics ( Hunter 2007 ).
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