{
    "Version": 1,
    "RAMSES": {
        "ndimensions": 3,
        "amr_field_descr": [
            {"__type__": "scalar_field", "__file_type__": "hydro", "name": "rho", "ivar": 0},
            {"__type__": "vector_field", "__file_type__": "hydro", "name": "vel", "ivars": [1, 2, 3]},
            {"__type__": "scalar_field", "__file_type__": "hydro", "name": "P", "ivar": 4},
            {"__type__": "scalar_field", "__file_type__": "grav", "name": "phi", "ivar": 0},
            {"__type__": "vector_field", "__file_type__": "grav", "name": "g", "ivars": [1, 2, 3]}
        ]
    }
}