| 
    
        
            | 
                    Closing price on 4/26/2011
                 |  |  
    
        |           
                
                    | Open | 7.20 |  
                    | High | 7.20 |  
                    | Low | 7.00 |  
                    | Volume | 40,830 |  
                    | Split-adjusted Price | 7.00 |  
                
             | 
 |  PXT Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 4/26/2011 | -0.30 / -4.11% | 7.20 | 7.20 | 7.00 | 7.00 | 7.00 | 7.00 | 40,830 |   |  
            | 4/25/2011 | +0.10 / +1.39% | 7.00 | 7.30 | 7.00 | 7.30 | 7.30 | 7.30 | 13,690 |   |  			
            | 4/22/2011 | 0.00 / 0.00% | 7.10 | 7.20 | 6.90 | 7.20 | 7.20 | 7.20 | 21,560 |   |  
            | 4/21/2011 | +0.10 / +1.41% | 7.10 | 7.20 | 7.00 | 7.20 | 7.20 | 7.20 | 16,360 |   |  			
            | 4/20/2011 | -0.10 / -1.39% | 7.20 | 7.30 | 7.00 | 7.10 | 7.10 | 7.10 | 29,740 |   |  
            | 4/19/2011 | -0.30 / -4.00% | 7.20 | 7.40 | 7.20 | 7.20 | 7.20 | 7.20 | 39,320 |   |  			
            | 4/18/2011 | +0.10 / +1.35% | 7.30 | 7.50 | 7.20 | 7.50 | 7.50 | 7.50 | 15,850 |   |  
            | 4/15/2011 | -0.10 / -1.33% | 7.70 | 7.70 | 7.40 | 7.40 | 7.40 | 7.40 | 14,040 |   |  			
            | 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 |   |  |