> stem(x, par1, par2, par3)
  The decimal point is at the |
   1 | 34
   1 | 799
   2 | 04
   2 | 569
   3 | 2344
   3 | 5699
   4 | 044
   4 | 579
   5 | 11
   5 | 5579
   6 | 024
   6 | 68
   7 | 3
   7 | 5568
   8 | 2
   8 | 
   9 | 0
   9 | 59
  10 | 1
  10 | 
  11 | 
  11 | 
  12 | 
  12 | 
  13 | 4
  13 | 
  14 | 13
  14 | 
  15 | 
  15 | 
  16 | 3
  16 | 
  17 | 
  17 | 
  18 | 
  18 | 
  19 | 
  19 | 
  20 | 2