   field  resistance   dR/dB
0    0.0     1.00000     NaN
1    0.1     1.00004  0.0008
2    0.2     1.00016  0.0016
3    0.3     1.00036  0.0024
4    0.4     1.00064  0.0032
    field  resistance   dR/dB
88    8.8     1.30976  0.0704
89    8.9     1.31684  0.0712
90    9.0     1.32400     NaN
