The energy content of the wind varies with the cube of the wind speed, as will be discussed later. This tells how much each sector contributes to the energy content of the wind at our particular location. The result is then normalised to add up to 100%. The innermost (red) wedge gives the same information as the first, but multiplied by the cube of the wind speed in each particular location. This tells how much each sector contributes to the average wind speed at our particular location. The second wedge gives the same information, but multiplied by the average wind speed in each particular direction. how many per cent of the time is the wind blowing from that direction. The radius of the 12 outermost, wide wedges gives the relative frequency of each of the 12 wind directions, i.e.
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