FILE - In this Jan. 5, 2014 file photo, a fan holds up a weather-related sign during the first half of an NFL wild-card playoff football game between the Green Bay Packers and the San Francisco 49ers, in Green Bay, Wis. 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/Jeffrey Phelps, File)
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