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This image may resolve the blue/red bimodal distribution problem.
Reviewers pointed out that this is an obvious orbital trend (red is
more distant than blue). We also note this image resolves many other
outstanding issues regarding the Kuiper belt: there is a
sharply-defined edge, well-populated regions (resonances), one of
which appears to be chemically distinct (depleted in lead), and an
unpopulated gap. [submitted by John Davies]
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