{
"projectile":[11.99, 6.0],
"energy":{
    "min": 100,
    "max": 1000,
    "step": 100
    },
"material":[{"A":12,
            "Z":6,
            "thickness":1.0
            },
            {
            "A":56,
            "Z":26,
            "density":7.8,
            "thickness":0.05
            }
            ]
}