> stem(x, par1, par2, par3)
  The decimal point is 3 digit(s) to the right of the |
  12 | 9
  13 | 03557
  14 | 0001234458999
  15 | 113455677789
  16 | 0022333444455579
  17 | 0002223455899
  18 | 115579999
  19 | 11124455
  20 | 00223
  21 | 3
  22 | 0