PyPSA-Eur: An open sector-coupled optimisation model of the European energy system - Brown, Tom; Victoria, Marta; Zeyen, Elisabeth; Hofmann, Fabian; Neumann, Fabian; Frysztacki, Martha; Hampp, Johannes; Schlachtberger, David; Hörsch, Jonas; Schledorn, Amos; Schauß, Caspar; van Greevenbroek, Koen; et al.