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            | 
                    Closing price on 1/27/2011
                 |  |  
    
        |           
                
                    | Open | 9.80 |  
                    | High | 9.90 |  
                    | Low | 9.60 |  
                    | Volume | 20,870 |  
                    | Split-adjusted Price | 9.90 |  
                
             | 
 |  PXT Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 1/27/2011 | +0.40 / +4.21% | 9.80 | 9.90 | 9.60 | 9.90 | 9.90 | 9.90 | 20,870 |   |  
            | 1/26/2011 | +0.10 / +1.06% | 9.40 | 9.60 | 9.40 | 9.50 | 9.50 | 9.50 | 40,900 |   |  			
            | 1/25/2011 | -0.10 / -1.05% | 9.40 | 9.80 | 9.40 | 9.40 | 9.40 | 9.40 | 13,040 |   |  
            | 1/24/2011 | -0.20 / -2.06% | 9.90 | 9.90 | 9.50 | 9.50 | 9.50 | 9.50 | 15,370 |   |  			
            | 1/21/2011 | -0.30 / -3.00% | 9.80 | 10.00 | 9.50 | 9.70 | 9.70 | 9.70 | 34,110 |   |  
            | 1/20/2011 | 0.00 / 0.00% | 10.00 | 10.00 | 9.90 | 10.00 | 10.00 | 10.00 | 39,100 |   |  			
            | 1/19/2011 | +0.20 / +2.04% | 10.00 | 10.10 | 9.60 | 10.00 | 10.00 | 10.00 | 39,980 |   |  
            | 1/18/2011 | -0.30 / -2.97% | 10.20 | 10.20 | 9.80 | 9.80 | 9.80 | 9.80 | 17,680 |   |  			
            | 1/17/2011 | +0.10 / +1.00% | 10.10 | 10.40 | 10.10 | 10.10 | 10.10 | 10.10 | 56,760 |   |  
            | 1/14/2011 | +0.10 / +1.01% | 10.20 | 10.20 | 9.80 | 10.00 | 10.00 | 10.00 | 29,680 |   |  			
            | 1/13/2011 | +0.40 / +4.21% | 9.90 | 9.90 | 9.70 | 9.90 | 9.90 | 9.90 | 27,330 |   |  
            | 1/12/2011 | 0.00 / 0.00% | 9.70 | 9.70 | 9.50 | 9.50 | 9.50 | 9.50 | 35,090 |   |  			
            | 1/11/2011 | -0.20 / -2.06% | 10.00 | 10.00 | 9.30 | 9.50 | 9.50 | 9.50 | 56,070 |   |  
            | 1/10/2011 | -0.20 / -2.02% | 9.60 | 10.10 | 9.60 | 9.70 | 9.70 | 9.70 | 19,480 |   |  			
            | 1/7/2011 | -0.10 / -1.00% | 10.20 | 10.20 | 9.90 | 9.90 | 9.90 | 9.90 | 19,230 |   |  
            | 1/6/2011 | 0.00 / 0.00% | 10.10 | 10.30 | 10.00 | 10.00 | 10.00 | 10.00 | 22,830 |   |  			
            | 1/5/2011 | -0.10 / -0.99% | 10.10 | 10.30 | 10.00 | 10.00 | 10.00 | 10.00 | 43,510 |   |  
            | 1/4/2011 | 0.00 / 0.00% | 10.20 | 10.40 | 10.10 | 10.10 | 10.10 | 10.10 | 17,250 |   |  			
            | 12/31/2010 | 0.00 / 0.00% | 10.40 | 10.40 | 10.10 | 10.10 | 10.10 | 10.10 | 25,950 |   |  
            | 12/30/2010 | +0.10 / +1.00% | 9.80 | 10.40 | 9.80 | 10.10 | 10.10 | 10.10 | 32,940 |   |  			
            | 12/29/2010 | -0.40 / -3.85% | 10.60 | 10.60 | 10.00 | 10.00 | 10.00 | 10.00 | 75,620 |   |  
            | 12/28/2010 | +0.10 / +0.97% | 10.40 | 10.50 | 10.30 | 10.40 | 10.40 | 10.40 | 70,040 |   |  			
            | 12/27/2010 | +0.20 / +1.98% | 10.50 | 10.50 | 10.10 | 10.30 | 10.30 | 10.30 | 70,990 |   |  
            | 12/24/2010 | -0.20 / -1.94% | 10.50 | 10.50 | 10.10 | 10.10 | 10.10 | 10.10 | 28,840 |   |  			
            | 12/23/2010 | -0.40 / -3.74% | 10.70 | 10.70 | 10.30 | 10.30 | 10.30 | 10.30 | 29,120 |   |  
            | 12/22/2010 | -0.30 / -2.73% | 11.30 | 11.30 | 10.70 | 10.70 | 10.70 | 10.70 | 30,620 |   |  			
            | 12/21/2010 | +0.20 / +1.85% | 10.80 | 11.30 | 10.30 | 11.00 | 11.00 | 11.00 | 54,950 |   |  
            | 12/20/2010 | -0.10 / -0.92% | 11.20 | 11.20 | 10.50 | 10.80 | 10.80 | 10.80 | 27,120 |   |  			
            | 12/17/2010 | +0.40 / +3.81% | 10.50 | 10.90 | 10.40 | 10.90 | 10.90 | 10.90 | 24,620 |   |  
            | 12/16/2010 | -0.20 / -1.87% | 10.40 | 10.50 | 10.20 | 10.50 | 10.50 | 10.50 | 98,280 |   |  |