{
    "A": {
        "1": {
            "value": 12.5, 
            "tolerance": 0.5
        }, 
        "2": {
            "value": 7.8, 
            "tolerance": 0.2
        }
    }, 
    "B": {
        "1": {
            "value": 3.4, 
            "tolerance": 0.1
        }
    }
}