FILE - In this Jan. 11, 2014 file photo, fans at CenturyLink Field watch during the first quarter of an NFC divisional playoff NFL football game between the Seattle Seahawks and the New Orleans Saints in Seattle. Fox Sports will use this weekend's NFC title game in Seattle between the San Francisco 49ers and the Seahawks to test an infrared camera that will show how players' body temperatures change throughout the game. (AP Photo/John Froschauer, File)
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