x1  y       
  1 30.69420
  2 31.38215
  3 26.87260
  4 29.40778
  5 27.61439
  6 23.62283
  7 24.07710
  8 23.42860
  9 22.19102
 10 22.61490
 11 20.17384
 12 19.05992
 13 18.89225
 14 19.31535
 15 15.52385
 16 12.52234
 17 12.46162
 18 10.86303
 19 11.82620
 21 12.21019
 22 13.26606
 23 13.71697
 24 16.18534
 25 16.13685
 26 16.96312
 27 18.60329
 28 18.50378
 29 18.83620
 30 20.05063
 31 20.58375
 32 21.63092
 33 21.16997
 34 22.65063
 35 24.68059
 36 26.51890
 37 25.08567
 38 27.10697
 39 26.83498
 40 27.39241