A Sotheby's employee poses with "Gudrun (633)" by Gerhard Richter from 1987 at Sotheby's in London October 7, 2011. The piece is estimated to sell between 3.5 million - 4.8 million pounds ($5.5 million - 7.5 million) when it is auctioned in New York on November 9.[Photo/Agencies]
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