By Philip Elmer-DeWitt
March 21, 2013

FORTUNE — One of the surprises in ComScore’s chart-packed Mobile Future in Focus “webinar” Wednesday was the relative sizes of the orange Amazon (AMZN) and red Samsung¬†bands in the chart above.

Apple (AAPL) maintained its position as the No. 1 tablet manufacturer, but in battle for dominance among the Android tablet makers in the U.S. market — which is what ComScore is measuring here — Amazon is crushing Samsung.

In the worldwide market, where Amazon has a far smaller presence, the relative positions are reversed. According to IDC, Apple was still the leader with a 43.6% share of shipments in Q4 2012 , followed by Samsung (15.1%) and then Amazon (11.5%).

Take these estimates with a grain of salt since Samsung no longer reports sales or shipment numbers and Amazon never did.

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