> stem(x, par1, par2, par3)
  The decimal point is 1 digit(s) to the right of the |
  -2 | 5
  -2 | 44220
  -1 | 9877555
  -1 | 4333211110
  -0 | 999998887776
  -0 | 444433332222211111
   0 | 0111122