# Wind speed distribution, Llyn Efyrnwy (1998)
# Speed (m/s)  Frequency
          0.5        753
          1.5        859
          2.5       1216
          3.5       1173
          4.5       1030
          5.5        807
          6.5        679
          7.5        473
          8.5        365
          9.5        268
         10.5        181
         11.5        154
         12.5         95
         13.5         52
         14.5         52
         15.5         30
         16.5         12
         17.5          1
         18.5          2
         19.5          1