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Hi Mark,
Thanks for the analyses and the rapid turnaround. It's great working with you. Attached is your spreasheet with a couple of summary plots that you might find interesting. I have included the previous results you generated for the case where no filtering on wind direction was done. The results indicate to me that the additional filtering of the data is overall improving the accuracy of the free-stream wind speed estimation (based on the mean nacelle wind speed and mean wind speed ratio), but at the cost of larger standard error because of the reduction in number of samples. Therefore, it seems that additional filtering might not be so valuable afterall. Any comments? Philippe
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