Specialist Thomas McArdle, left, and trader Michael Zicchinolfi work at the post 

Specialist Thomas McArdle, left, and trader Michael Zicchinolfi work at the post that handles Edwards Lifesciences on the floor of the New York Stock Exchange Tuesday, Oct. 9, 2012.  Edwards Lifesciences dropped $21.05 to $86.31 after the company reported revenue that fell well short of analyst's forecasts. (AP Photo/Richard Drew)
Associated Press
Specialist Thomas McArdle, left, and trader Michael Zicchinolfi work at the post that handles Edwards Lifesciences on the floor of the New York Stock Exchange Tuesday, Oct. 9, 2012. Edwards Lifesciences dropped $21.05 to $86.31 after the company reported revenue that fell well short of analyst's forecasts. (AP Photo/Richard Drew)
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