PPE_Nocrop   PPE_Crop
    0       1.42      1.40
    1       2.04      2.03
    2       0.49      0.29
    3       1.57      5.69
    4       0.27      0.11
    5       0.54      4.30
    6       0.43      0.35
    7       1.04      4.57
    8       0.87      0.67
    9       4.47      9.11
   10       0.38      0.01
   11       3.69      8.38
   12      52.60     45.97