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<DIV>Oops regarding my previous post; a couple people have pointed out that the link does not work for non-subscribers. (I don't subscribe but my day-job institution does so that the link worked OK for me.) Too bad Nature isn't getting with the open-access program. Anyway, sorry, take a look at a hardcopy if you can. Cheers,</DIV>
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<DIV> Steve</DIV></BODY></HTML>