Country-level HDD and runoff data for rescaling PyPSA-Eur

Intermediary files for PyPSA-Eur model. These files were previously included in the PyPSA-Eur databundle . In order to maintain and update them separately, they have been moved to a dedicated record. These are intermediary files, that require significant time to download the historic weather data for and to process them.For this reason these files are provided complementary to the model, but they can also be produced as part of the workflow. era5-HDD-per-country.csv - Based on this script: https://gist.github.com/fneum/d99e24e19da423038fd55fe3a4ddf875- License: CC-BY 4.0- Contains country-level heating degree days in Europe for 1941-2023. Used for rescaling heat demand in weather years not covered by energy balance statistics. era5-runoff-per-country.csv - Based on this script: https://gist.github.com/fneum/d99e24e19da423038fd55fe3a4ddf875- License: CC-BY 4.0- Contains country-level daily sum of runoff in Europe for 1941-2023. Used for rescaling hydro-electricity availability in weather years not covered by EIA hydro-generation statistics.