| 
                 
                    Closing price on 2/21/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    8.50 | 
                 
                
                    | High | 
                    8.50 | 
                 
                
                    | Low | 
                    8.40 | 
                     
                
                    | Volume | 
                    84,720 | 
                                 
                
                    | Split-adjusted Price | 
                    8.40 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PXT Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                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
             |            
            
                 
             |                                       
         
    
        
            | 
                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
             |  
            
                 
             |                                                              
             
    
         
    
    
 |