A woman looks at a triptych by artist Francis Bacon entitled "Three studies for a Self Portrait" at Sotheby's auction house during a press preview in London, Thursday, Jan. 31, 2013. The work is estimated to sell for some 10 to 15 million pounds (US$ 15.8-23.7 million, euro 11.6-17.5 million )at auction on Feb. 12, in London. (AP Photo/Alastair Grant)

Associated Press
A woman looks at a triptych by artist Francis Bacon entitled "Three studies for a Self Portrait" at Sotheby's auction house during a press preview in London, Thursday, Jan. 31, 2013. The work is estimated to sell for some 10 to 15 million pounds (US$ 15.8-23.7 million, euro 11.6-17.5 million )at auction on Feb. 12, in London. (AP Photo/Alastair Grant)
A woman looks at a triptych by artist Francis Bacon entitled "Three studies for a Self Portrait" at Sotheby's auction house during a press preview in London, Thursday, Jan. 31, 2013. The work is estimated to sell for some 10 to 15 million pounds (US$ 15.8-23.7 million, euro 11.6-17.5 million )at auction on Feb. 12, in London. (AP Photo/Alastair Grant)
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