Polytope has been developed at ECMWF as part of the EU projects LEXIS <https://lexis-project.eu/web/>_ and HiDALGO <https://hidalgo-project.eu/>_. The LEXIS and HiDALGO projects have received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreements No. 825532 and No. 824115.