By Philip Elmer-DeWitt
December 27, 2012

FORTUNE — I can’t vouch for the accuracy of the information in this chart. The nominal source — A.X. Ian — ¬†describes himself on Twitter and other venues as “Purveyor of pseudo-random ideas. Information massage therapist. Always prolific, seldom profound.”

But the ratios square with other signs we’ve been seeing — including store traffic — and bode better for the holiday sales of Apple’s (AAPL) tablet computers than for Amazon’s (AMZN), Google’s (GOOG) or Microsoft’s (MSFT).

Thanks to reader Navin Nagrani for the tip.

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