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. 2012 Sep 5;19(Pt 6):1006–1011. doi: 10.1107/S0909049512035571

Table 1. Coefficients used to approximate P with P n when n = 8.

  i
  1 2 3 4 5 6 7 8
a i 0.1245 0.3170 0.2540 0.1474 0.07857 0.04120 0.02243 0.01494
b i 1.1401 2.1722 4.182 8.070 15.57 30.08 59.09 135.96