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Sotheby's London auction house directors Oliver Barker, left, and Cheyenne Westphal, check the lighting Thursday Jan. 31, 2002 on American artist Andy Warhol's Mona Lisa work, expected to fetch around 450,000 to 650,000 pounds, (US Dlrs 636,000 to 918,000) in an upcoming Sotheby's sale on Feb. 5, 2002. (AP Photo/Max Nash)