> stem(x, par1, par2, par3)
  The decimal point is 1 digit(s) to the right of the |
  0 | 011112223334466779
  1 | 000112223344445555677788999
  2 | 00022223344557788899
  3 | 003445555566899
  4 | 000112234444666678
  5 | 00