> stem(x, par1, par2, par3)
  The decimal point is 4 digit(s) to the right of the |
   3 | 779
   4 | 4468
   5 | 36777
   6 | 00556667999
   7 | 000122699
   8 | 012223345799
   9 | 00223334666
  10 | 000112223333445555899
  11 | 0122234556799
  12 | 0445566789
  13 | 144579
  14 | 0014445777
  15 | 000022456
  16 | 0166689
  17 | 06
  18 | 457
  19 | 7