> stem(x, par1, par2, par3)
  The decimal point is 1 digit(s) to the right of the |
   7 | 000001111111111112222222222233333444
   7 | 555567778888999
   8 | 
   8 | 569999
   9 | 0000000011112233344
   9 | 555566799
  10 | 0000