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            | 
                    Closing price on 3/18/2011
                 |  |  
    
        |           
                
                    | Open | 8.70 |  
                    | High | 9.10 |  
                    | Low | 8.60 |  
                    | Volume | 82,630 |  
                    | Split-adjusted Price | 9.10 |  
                
             | 
 |  PXT Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 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 |   |  
            | 3/1/2011 | -0.30 / -3.37% | 8.60 | 8.80 | 8.60 | 8.60 | 8.60 | 8.60 | 47,390 |   |  			
            | 2/28/2011 | -0.40 / -4.30% | 9.30 | 9.50 | 8.90 | 8.90 | 8.90 | 8.90 | 114,740 |   |  
            | 2/25/2011 | +0.40 / +4.49% | 9.30 | 9.30 | 9.10 | 9.30 | 9.30 | 9.30 | 185,890 |   |  			
            | 2/24/2011 | +0.40 / +4.71% | 8.90 | 8.90 | 8.90 | 8.90 | 8.90 | 8.90 | 119,260 |   |  
            | 2/23/2011 | +0.40 / +4.94% | 8.00 | 8.50 | 8.00 | 8.50 | 8.50 | 8.50 | 125,490 |   |  			
            | 2/22/2011 | -0.30 / -3.57% | 8.40 | 8.40 | 8.00 | 8.10 | 8.10 | 8.10 | 30,870 |   |  
            | 2/21/2011 | -0.40 / -4.55% | 8.50 | 8.50 | 8.40 | 8.40 | 8.40 | 8.40 | 84,720 |   |  			
            | 2/18/2011 | -0.20 / -2.22% | 9.20 | 9.20 | 8.70 | 8.80 | 8.80 | 8.80 | 54,050 |   |  
            | 2/17/2011 | -0.40 / -4.26% | 9.30 | 9.30 | 9.00 | 9.00 | 9.00 | 9.00 | 68,610 |   |  			
            | 2/16/2011 | -0.10 / -1.05% | 9.50 | 9.60 | 9.40 | 9.40 | 9.40 | 9.40 | 10,060 |   |  
            | 2/15/2011 | -0.10 / -1.04% | 9.50 | 9.60 | 9.50 | 9.50 | 9.50 | 9.50 | 12,660 |   |  			
            | 2/14/2011 | -0.20 / -2.04% | 9.90 | 9.90 | 9.60 | 9.60 | 9.60 | 9.60 | 27,520 |   |  
            | 2/11/2011 | -0.10 / -1.01% | 9.90 | 9.90 | 9.50 | 9.80 | 9.80 | 9.80 | 30,330 |   |  			
            | 2/10/2011 | -0.10 / -1.00% | 9.80 | 9.90 | 9.70 | 9.90 | 9.90 | 9.90 | 23,310 |   |  
            | 2/9/2011 | +0.10 / +1.01% | 10.10 | 10.10 | 9.50 | 10.00 | 10.00 | 10.00 | 16,710 |   |  			
            | 2/8/2011 | +0.10 / +1.02% | 10.00 | 10.00 | 9.60 | 9.90 | 9.90 | 9.90 | 860 |   |  
            | 1/28/2011 | -0.10 / -1.01% | 9.90 | 9.90 | 9.80 | 9.80 | 9.80 | 9.80 | 20,830 |   |  |