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To Scruffy:
are you serious? a 1 sigma observational discrepancy means that, given a large number of repeats of such an experiment, roughly 33% of such experiments would disagree at the 1 sigma level, even if they were perfectly consistent with Einstein's GR (given an observation with no experimental error)... so I would consider this excellent agreement with GR - only if there were something like a 3 sigma or greater discrepancy would I begin to get worried -
they do, of course, have a long way to go to verify the Lens-Thirring (frame-dragging) effect ... much more difficult analysis ..
X-ray man