Gas definition files used in REST-for-Physics.
The gas files defined in this repository are available at https://rest-for-physics.github.io/gas-files/ (e.g. https://rest-for-physics.github.io/gas-files/xe_95.0-CF4_5.0-E_vs_P_20.0_1000.0_nodes_20-nCol_10-maxE_400.gas).