The red fog in the left of this picture is probably stray UV, but the faint vertical line, from the centre of the barrow, isn't explained by that.
http://www.themodernantiquarian.com/image.php?image_id=11359
Same thing here, very faint. http://www.joeporter.saltire.org/bluestone/shayne/call6.html
(Pete G. has seen this and says it's a scan line, but all he ever comes up with is logical explanations).
Same (reddish) line I have on mine!! Goes straight throu the middle of all the stones!! Hmmmmm curiouser and curiouser....
You'll have to take me word for it mind as I don't have a scanner and stuff so can't put them on the computer!!
N x
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