PPE_Nocrop   PPE_Crop
    0       1.20      0.96
    1       0.72     12.94
    2       0.81      0.52
    3       2.23     19.59
    4       0.80      0.50
    5       1.83     19.72
    6       0.62      0.38
    7       1.91     16.44
    8       0.90      0.67
    9       7.87     17.14
   10       0.89      0.49
   11       3.59     24.08
   12      18.16     19.53