wt       len
  1  4.955346
  2  7.778002
  3 11.009804
  4 13.781379
  5 17.121387
  6 20.096052
  7 22.757872
  8 26.296660
  9 28.860201
 10 32.065037
  1  5.024026
  2  8.291675
  3 11.234149
  4 13.586474
  5 17.616297
  6 19.145024
  7 23.925252
  8 26.133324
  9 29.534745
 10 31.927651
  1  5.377990
  2  8.435258
  3 11.008928
  4 13.384865
  5 16.664028
  6 20.062194
  7 22.856284
  8 25.996484
  9 29.120754
 10 32.692438