{
    "per_ini": 17.59,
    "per_fin": 17.66,
    "lambda_3": 0.75,
    "T_cristal": 25,
    "thet": 0,
    "n_material": 0,
    "n_chirp": 1,
    "n_exp": 1,
    "lcristal": 15,
    "D_chirp": 0.05,
    "z0x": 0
}