Marking the trees

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    Before felling the trees are marked with an identification code, a line indicating North, and a line at "breast height" (1.3 metres)

    This is cross-view stereopair. To view this image in 3D you need to cross your eyes until you see three fuzzy images. Then try and focus the middle image. This takes a lot of patience to get right, but once you've done it once it gets easier.

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