FILE - In this Thursday, Jan. 31, 2013 file photo, traders work on the floor of the New York Stock Exchange in New York. Going into Tuesday, Feb. 5, 2013, stock futures are heading higher after the biggest sell-off this year, with strong economic data coming out of Europe and the U.S. service industry expected to show further expansion, though at a slower pace. (AP Photo/Seth Wenig, File)

Associated Press
FILE - In this Thursday, Jan. 31, 2013 file photo, traders work on the floor of the New York Stock Exchange in New York. Going into Tuesday, Feb. 5, 2013, stock futures are heading higher after the biggest sell-off this year, with strong economic data coming out of Europe and the U.S. service industry expected to show further expansion, though at a slower pace. (AP Photo/Seth Wenig, File)
FILE - In this Thursday, Jan. 31, 2013 file photo, traders work on the floor of the New York Stock Exchange in New York. Going into Tuesday, Feb. 5, 2013, stock futures are heading higher after the biggest sell-off this year, with strong economic data coming out of Europe and the U.S. service industry expected to show further expansion, though at a slower pace. (AP Photo/Seth Wenig, File)
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