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                    Closing price on 4/14/2011
                 |  |  
    
        |           
                
                    | Open | 7.50 |  
                    | High | 7.60 |  
                    | Low | 7.50 |  
                    | Volume | 18,650 |  
                    | Split-adjusted Price | 7.50 |  
                
             | 
 |  PXT Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 4/14/2011 | -0.10 / -1.32% | 7.50 | 7.60 | 7.50 | 7.50 | 7.50 | 7.50 | 18,650 |   |  
            | 4/13/2011 | -0.10 / -1.30% | 7.70 | 7.70 | 7.50 | 7.60 | 7.60 | 7.60 | 30,980 |   |  			
            | 4/8/2011 | +0.10 / +1.32% | 7.80 | 7.80 | 7.60 | 7.70 | 7.70 | 7.70 | 18,840 |   |  
            | 4/7/2011 | -0.20 / -2.56% | 8.00 | 8.00 | 7.60 | 7.60 | 7.60 | 7.60 | 47,110 |   |  			
            | 4/6/2011 | 0.00 / 0.00% | 7.80 | 7.90 | 7.70 | 7.80 | 7.80 | 7.80 | 12,020 |   |  
            | 4/5/2011 | -0.10 / -1.27% | 8.10 | 8.10 | 7.70 | 7.80 | 7.80 | 7.80 | 10,000 |   |  			
            | 4/4/2011 | +0.10 / +1.28% | 8.00 | 8.00 | 7.60 | 7.90 | 7.90 | 7.90 | 1,020 |   |  
            | 4/1/2011 | +0.20 / +2.63% | 7.90 | 7.90 | 7.80 | 7.80 | 7.80 | 7.80 | 8,530 |   |  			
            | 3/31/2011 | -0.30 / -3.80% | 8.10 | 8.10 | 7.60 | 7.60 | 7.60 | 7.60 | 21,880 |   |  
            | 3/30/2011 | +0.10 / +1.28% | 7.90 | 7.90 | 7.80 | 7.90 | 7.90 | 7.90 | 15,810 |   |  			
            | 3/29/2011 | -0.20 / -2.50% | 8.10 | 8.20 | 7.80 | 7.80 | 7.80 | 7.80 | 38,370 |   |  
            | 3/28/2011 | 0.00 / 0.00% | 8.20 | 8.30 | 8.00 | 8.00 | 8.00 | 8.00 | 33,310 |   |  			
            | 3/25/2011 | -0.30 / -3.61% | 8.30 | 8.40 | 8.00 | 8.00 | 8.00 | 8.00 | 33,620 |   |  
            | 3/24/2011 | -0.70 / -7.78% | 8.50 | 8.50 | 8.30 | 8.30 | 8.30 | 8.30 | 56,820 |   |  			
            | 3/23/2011 | +0.10 / +1.12% | 8.80 | 9.00 | 8.80 | 9.00 | 9.00 | 9.00 | 31,540 |   |  
            | 3/22/2011 | -0.10 / -1.11% | 9.00 | 9.00 | 8.90 | 8.90 | 8.90 | 8.90 | 27,130 |   |  			
            | 3/21/2011 | -0.10 / -1.10% | 9.10 | 9.10 | 8.90 | 9.00 | 9.00 | 9.00 | 65,730 |   |  
            | 3/18/2011 | +0.40 / +4.60% | 8.70 | 9.10 | 8.60 | 9.10 | 9.10 | 9.10 | 82,630 |   |  			
            | 3/17/2011 | 0.00 / 0.00% | 8.80 | 8.80 | 8.60 | 8.70 | 8.70 | 8.70 | 19,130 |   |  
            | 3/16/2011 | +0.20 / +2.35% | 8.80 | 8.80 | 8.60 | 8.70 | 8.70 | 8.70 | 92,790 |   |  			
            | 3/15/2011 | -0.10 / -1.16% | 8.40 | 8.60 | 8.40 | 8.50 | 8.50 | 8.50 | 10,630 |   |  
            | 3/14/2011 | -0.40 / -4.44% | 9.00 | 9.00 | 8.60 | 8.60 | 8.60 | 8.60 | 23,370 |   |  			
            | 3/11/2011 | +0.40 / +4.65% | 8.90 | 9.00 | 8.90 | 9.00 | 9.00 | 9.00 | 141,360 |   |  
            | 3/10/2011 | +0.40 / +4.88% | 8.30 | 8.60 | 8.30 | 8.60 | 8.60 | 8.60 | 93,330 |   |  			
            | 3/9/2011 | -0.10 / -1.20% | 8.30 | 8.30 | 8.00 | 8.20 | 8.20 | 8.20 | 31,210 |   |  
            | 3/8/2011 | -0.20 / -2.35% | 8.50 | 8.50 | 8.30 | 8.30 | 8.30 | 8.30 | 30,590 |   |  			
            | 3/7/2011 | +0.20 / +2.41% | 8.50 | 8.60 | 8.40 | 8.50 | 8.50 | 8.50 | 28,610 |   |  
            | 3/4/2011 | +0.20 / +2.47% | 8.30 | 8.50 | 8.20 | 8.30 | 8.30 | 8.30 | 87,030 |   |  			
            | 3/3/2011 | -0.10 / -1.22% | 7.90 | 8.40 | 7.90 | 8.10 | 8.10 | 8.10 | 31,820 |   |  
            | 3/2/2011 | -0.40 / -4.65% | 8.60 | 8.60 | 8.20 | 8.20 | 8.20 | 8.20 | 67,570 |   |  |