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            | 
                    Closing price on 10/13/2010
                 |  |  
    
        |           
                
                    | Open | 12.70 |  
                    | High | 12.80 |  
                    | Low | 12.50 |  
                    | Volume | 31,100 |  
                    | Split-adjusted Price | 12.60 |  
                
             | 
 |  PXT Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 10/13/2010 | +0.20 / +1.61% | 12.70 | 12.80 | 12.50 | 12.60 | 12.60 | 12.60 | 31,100 |   |  
            | 10/12/2010 | -0.20 / -1.59% | 12.60 | 12.60 | 12.20 | 12.40 | 12.40 | 12.40 | 24,800 |   |  			
            | 10/11/2010 | -0.10 / -0.79% | 12.70 | 12.80 | 12.60 | 12.60 | 12.60 | 12.60 | 27,900 |   |  
            | 10/8/2010 | -0.30 / -2.31% | 13.00 | 13.00 | 12.70 | 12.70 | 12.70 | 12.70 | 36,290 |   |  			
            | 10/7/2010 | -0.30 / -2.26% | 13.40 | 13.40 | 12.70 | 13.00 | 13.00 | 13.00 | 39,200 |   |  
            | 10/6/2010 | +0.30 / +2.31% | 13.20 | 13.40 | 13.10 | 13.30 | 13.30 | 13.30 | 78,720 |   |  			
            | 10/5/2010 | +0.20 / +1.56% | 13.10 | 13.10 | 12.40 | 13.00 | 13.00 | 13.00 | 30,300 |   |  
            | 10/4/2010 | -0.60 / -4.48% | 13.20 | 13.40 | 12.80 | 12.80 | 12.80 | 12.80 | 210,880 |   |  			
            | 10/1/2010 | -0.50 / -3.60% | 13.90 | 13.90 | 13.40 | 13.40 | 13.40 | 13.40 | 70,480 |   |  
            | 9/30/2010 | +0.30 / +2.21% | 13.90 | 13.90 | 13.50 | 13.90 | 13.90 | 13.90 | 33,860 |   |  			
            | 9/29/2010 | -0.50 / -3.55% | 14.10 | 14.20 | 13.50 | 13.60 | 13.60 | 13.60 | 134,990 |   |  
            | 9/28/2010 | -0.10 / -0.70% | 14.70 | 14.80 | 14.10 | 14.10 | 14.10 | 14.10 | 56,700 |   |  			
            | 9/27/2010 | -0.30 / -2.07% | 14.30 | 14.50 | 14.10 | 14.20 | 14.20 | 14.20 | 97,380 |   |  
            | 9/24/2010 | +0.20 / +1.40% | 14.50 | 14.50 | 14.10 | 14.50 | 14.50 | 14.50 | 54,220 |   |  			
            | 9/23/2010 | -0.20 / -1.38% | 14.60 | 14.60 | 13.80 | 14.30 | 14.30 | 14.30 | 113,980 |   |  
            | 9/22/2010 | -0.20 / -1.36% | 14.60 | 14.80 | 14.40 | 14.50 | 14.50 | 14.50 | 69,800 |   |  			
            | 9/21/2010 | -0.40 / -2.65% | 15.20 | 15.20 | 14.60 | 14.70 | 14.70 | 14.70 | 84,630 |   |  
            | 9/20/2010 | +0.20 / +1.34% | 15.60 | 15.60 | 15.10 | 15.10 | 15.10 | 15.10 | 198,770 |   |  			
            | 9/17/2010 | +0.70 / +4.93% | 14.60 | 14.90 | 14.60 | 14.90 | 14.90 | 14.90 | 195,340 |   |  
            | 9/16/2010 | +0.10 / +0.71% | 14.40 | 14.40 | 14.10 | 14.20 | 14.20 | 14.20 | 32,470 |   |  			
            | 9/15/2010 | -0.60 / -4.08% | 14.70 | 14.70 | 14.00 | 14.10 | 14.10 | 14.10 | 146,810 |   |  
            | 9/14/2010 | +0.10 / +0.68% | 14.90 | 14.90 | 14.50 | 14.70 | 14.70 | 14.70 | 127,700 |   |  			
            | 9/13/2010 | -0.70 / -4.58% | 15.00 | 15.20 | 14.60 | 14.60 | 14.60 | 14.60 | 222,820 |   |  
            | 9/10/2010 | -0.40 / -2.55% | 15.70 | 16.40 | 15.30 | 15.30 | 15.30 | 15.30 | 325,210 |   |  			
            | 9/9/2010 | +0.70 / +4.67% | 15.50 | 15.70 | 15.20 | 15.70 | 15.70 | 15.70 | 300,840 |   |  
            | 9/8/2010 | -0.20 / -1.32% | 14.60 | 15.30 | 14.60 | 15.00 | 15.00 | 15.00 | 309,560 |   |  			
            | 9/7/2010 | +0.70 / +4.83% | 15.20 | 15.20 | 14.50 | 15.20 | 15.20 | 15.20 | 403,340 |   |  
            | 9/6/2010 | +0.60 / +4.32% | 14.50 | 14.50 | 14.50 | 14.50 | 14.50 | 14.50 | 18,510 |   |  			
            | 9/1/2010 | +0.60 / +4.51% | 13.70 | 13.90 | 13.20 | 13.90 | 13.90 | 13.90 | 259,330 |   |  
            | 8/31/2010 | +0.60 / +4.72% | 12.70 | 13.30 | 12.50 | 13.30 | 13.30 | 13.30 | 239,960 |   |  |