# Wind speed distribution, Llyn Efyrnwy (1998)
# Speed (m/s)   Rel. Freq.
          0.5       0.0918
          1.5       0.1047
          2.5       0.1482
          3.5       0.1430
          4.5       0.1256
          5.5       0.0984
          6.5       0.0828
          7.5       0.0577
          8.5       0.0445
          9.5       0.0327
         10.5       0.0221
         11.5       0.0188
         12.5       0.0116
         13.5       0.0063
         14.5       0.0063
         15.5       0.0037
         16.5       0.0015
         17.5       0.0001
         18.5       0.0002
         19.5       0.0001