> stem(x, par1, par2, par3)
  The decimal point is 3 digit(s) to the right of the |
  4 | 
  4 | 556788
  5 | 0001111222223333344
  5 | 55556688999999
  6 | 0001111223444
  6 | 56677789
  7 | 000111223344
  7 | 55566777788899
  8 | 0011123333333444444
  8 | 555666667777888999
  9 | 14
  9 | 5