0.5           1.3
          1.5           1.3
          2.5           1.9
          3.5           3.4
          4.5           5.3
          5.5           7.1
          6.5          10.6
          7.5          16.0
          8.5          16.4
          9.5          18.3
         10.5          20.9
         11.5          20.5
         12.5          21.3
         13.5          21.2
         14.5          20.9