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Market research firm Strategy Analytics has released tablet shipment numbers for the first quarter of 2013. The overall market continues to expand, with shipments of branded tablets growing to 40.6 million units—more than doubling the 18.7 million units from Q1 last year. Apple's iPads continue to make up the bulk of the market, but their share slipped to 48.2%, down from 63.1% a year ago. Android-based devices made up 43.4% of the market, up from 34.2% last year, while Windows carved out a 7.5% share.