Untitled

   |
90 |       x
   |
80 |             x
   |
70 |                   x
   |
60 |                         x
   |
50 |                   x
   |
40 |             x
   |
30 |       x
   |
20 | x
   |
10 | x
   +-------------------
    10  20  30  40  50