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                    Closing price on 8/11/2010
                 |  |  
    
        |           
                
                    | Open | 16.60 |  
                    | High | 16.60 |  
                    | Low | 15.50 |  
                    | Volume | 106,660 |  
                    | Split-adjusted Price | 16.00 |  
                
             | 
 |  PXT Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 8/11/2010 | -0.10 / -0.62% | 16.60 | 16.60 | 15.50 | 16.00 | 16.00 | 16.00 | 106,660 |   |  
            | 8/10/2010 | -0.80 / -4.73% | 16.20 | 16.30 | 16.10 | 16.10 | 16.10 | 16.10 | 245,690 |   |  			
            | 8/9/2010 | -0.80 / -4.52% | 17.50 | 17.60 | 16.90 | 16.90 | 16.90 | 16.90 | 213,390 |   |  
            | 8/6/2010 | -0.50 / -2.75% | 18.20 | 18.20 | 17.70 | 17.70 | 17.70 | 17.70 | 107,970 |   |  			
            | 8/5/2010 | -0.20 / -1.09% | 18.60 | 19.00 | 18.20 | 18.20 | 18.20 | 18.20 | 77,610 |   |  
            | 8/4/2010 | -0.20 / -1.08% | 18.30 | 18.50 | 18.00 | 18.40 | 18.40 | 18.40 | 109,110 |   |  			
            | 8/3/2010 | 0.00 / 0.00% | 18.60 | 19.10 | 18.50 | 18.60 | 18.60 | 18.60 | 95,040 |   |  
            | 8/2/2010 | -0.40 / -2.11% | 19.00 | 19.30 | 18.60 | 18.60 | 18.60 | 18.60 | 152,540 |   |  			
            | 7/30/2010 | 0.00 / 0.00% | 18.90 | 19.50 | 18.60 | 19.00 | 19.00 | 19.00 | 114,900 |   |  
            | 7/29/2010 | -0.10 / -0.52% | 19.20 | 19.20 | 18.60 | 19.00 | 19.00 | 19.00 | 120,010 |   |  			
            | 7/28/2010 | -0.90 / -4.50% | 19.40 | 19.90 | 19.10 | 19.10 | 19.10 | 19.10 | 146,770 |   |  
            | 7/27/2010 | -0.10 / -0.50% | 20.40 | 20.40 | 19.60 | 20.00 | 20.00 | 20.00 | 209,290 |   |  			
            | 7/26/2010 | +0.80 / +4.15% | 19.80 | 20.20 | 19.30 | 20.10 | 20.10 | 20.10 | 498,860 |   |  
            | 7/23/2010 | 0.00 / 0.00% | 19.60 | 19.60 | 19.30 | 19.30 | 19.30 | 19.30 | 67,170 |   |  			
            | 7/22/2010 | 0.00 / 0.00% | 19.80 | 19.90 | 19.30 | 19.30 | 19.30 | 19.30 | 105,390 |   |  
            | 7/21/2010 | -0.50 / -2.53% | 20.00 | 20.00 | 19.30 | 19.30 | 19.30 | 19.30 | 211,920 |   |  			
            | 7/20/2010 | -0.40 / -1.98% | 20.10 | 20.20 | 19.80 | 19.80 | 19.80 | 19.80 | 189,210 |   |  
            | 7/19/2010 | -0.50 / -2.42% | 20.70 | 20.80 | 20.00 | 20.20 | 20.20 | 20.20 | 196,240 |   |  			
            | 7/16/2010 | -0.20 / -0.96% | 20.50 | 21.00 | 20.50 | 20.70 | 20.70 | 20.70 | 236,670 |   |  
            | 7/15/2010 | +0.30 / +1.46% | 20.70 | 21.50 | 20.60 | 20.90 | 20.90 | 20.90 | 509,280 |   |  			
            | 7/14/2010 | 0.00 / 0.00% | 21.60 | 21.60 | 20.60 | 20.60 | 20.60 | 20.60 | 1,424,280 |   |  
            | 7/13/2010 | +0.90 / +4.57% | 20.60 | 20.60 | 20.60 | 20.60 | 20.60 | 20.60 | 112,480 |   |  			
            | 7/12/2010 | +0.90 / +4.79% | 19.00 | 19.70 | 19.00 | 19.70 | 19.70 | 19.70 | 328,720 |   |  
            | 7/9/2010 | +0.80 / +4.44% | 18.00 | 18.90 | 18.00 | 18.80 | 18.80 | 18.80 | 301,420 |   |  			
            | 7/8/2010 | -0.50 / -2.70% | 18.50 | 18.60 | 18.00 | 18.00 | 18.00 | 18.00 | 174,680 |   |  
            | 7/7/2010 | -0.30 / -1.60% | 19.50 | 19.50 | 18.50 | 18.50 | 18.50 | 18.50 | 120,400 |   |  			
            | 7/6/2010 | -0.80 / -4.08% | 19.60 | 19.60 | 18.80 | 18.80 | 18.80 | 18.80 | 194,460 |   |  
            | 7/5/2010 | -0.20 / -1.01% | 19.90 | 19.90 | 19.50 | 19.60 | 19.60 | 19.60 | 229,590 |   |  			
            | 7/2/2010 | +0.30 / +1.54% | 20.00 | 20.00 | 19.40 | 19.80 | 19.80 | 19.80 | 132,860 |   |  
            | 7/1/2010 | -0.20 / -1.02% | 19.70 | 20.00 | 19.30 | 19.50 | 19.50 | 19.50 | 129,410 |   |  |