N   Crack size
  5000  0.010616
  5100  0.009280
  5200  0.008395
  5300  0.009896
  5400  0.013153
  5500  0.009128
  5600  0.010079
  5700  0.010007
  5800  0.008712
  5900  0.011442
  6000  0.013523
  6100  0.014120
  6200  0.013205
  6300  0.011339
  6400  0.011013
  6500  0.013565
  6600  0.014895
  6700  0.015363
  6800  0.010515
  6900  0.013143
  7000  0.011245
  7100  0.012230
  7200  0.016263
  7300  0.012393
  7400  0.012211
  7500  0.015024
  7600  0.013940
  7700  0.014648
  7800  0.017423
  7900  0.018040
  8000  0.017434
  8100  0.016219
  8200  0.017957
  8300  0.015786
  8400  0.018627
  8500  0.019420
  8600  0.019444
  8700  0.018411
  8800  0.019043
  8900  0.018440
  9000  0.022772
  9100  0.021581
  9200  0.021418
  9300  0.024650
  9400  0.022178
  9500  0.026639
  9600  0.027340
  9700  0.028456
  9800  0.026612
  9900  0.027785
 10000  0.031841