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Geographical variation in crown density for oak between 2000 and 2005. White circles show the locations of plots, and figures within the circles are mean crown densities (%). Some plots are too close to be distinguished individually. The value assigned to each 20 km square was calculated from weighted averages (weight is proportional to 1/d², where d = distance) for all plots within 70 km of the 20 km square centre.
Scots pine 2000
Scots pine 2001
Scots pine 2002
Scots pine 2003
Scots pine 2004
Scots pine 2005
Scots pine 2006
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