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UPDATE: I discovered my error with this post. I had left the KNMI data filter at its default setting of 30% of the valid points for the region. By changing the setting to 1% the data does change.
This post has been corrected and the update is available here:
http://bobtisdale.blogspot.com/2009/01/land-surface-temperature-comparison-by_07.html
Bob Tisdale - Climate Observations 
>Hello It has a nice blog. Sorry not write more, but my English is bad writing. A hug from my country, Portugal