| 
                 
                    Closing price on 9/9/2010
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    15.50 | 
                 
                
                    | High | 
                    15.70 | 
                 
                
                    | Low | 
                    15.20 | 
                     
                
                    | Volume | 
                    300,840 | 
                                 
                
                    | Split-adjusted Price | 
                    15.70 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PXT Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                9/9/2010
             | 
            
                +0.70 / +4.67%
             |             
            
                15.50
             |           
            
                15.70
             |               
            
                15.20
             |                           
            
                15.70
             | 
            
                15.70
             |                     
            
                15.70
             |                                 
            
                300,840
             |            
            
                 
             |                                       
         
    
        
            | 
                9/8/2010
             | 
            
                -0.20 / -1.32%
             |             
            
                14.60
             |           
            
                15.30
             |               
            
                14.60
             |                           
            
                15.00
             | 
            
                15.00
             |                     
            
                15.00
             |                                 
            
                309,560
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/7/2010
             | 
            
                +0.70 / +4.83%
             |             
            
                15.20
             |           
            
                15.20
             |               
            
                14.50
             |                           
            
                15.20
             | 
            
                15.20
             |                     
            
                15.20
             |                                 
            
                403,340
             |            
            
                 
             |                                       
         
    
        
            | 
                9/6/2010
             | 
            
                +0.60 / +4.32%
             |             
            
                14.50
             |           
            
                14.50
             |               
            
                14.50
             |                           
            
                14.50
             | 
            
                14.50
             |                     
            
                14.50
             |                                 
            
                18,510
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/1/2010
             | 
            
                +0.60 / +4.51%
             |             
            
                13.70
             |           
            
                13.90
             |               
            
                13.20
             |                           
            
                13.90
             | 
            
                13.90
             |                     
            
                13.90
             |                                 
            
                259,330
             |            
            
                 
             |                                       
         
    
        
            | 
                8/31/2010
             | 
            
                +0.60 / +4.72%
             |             
            
                12.70
             |           
            
                13.30
             |               
            
                12.50
             |                           
            
                13.30
             | 
            
                13.30
             |                     
            
                13.30
             |                                 
            
                239,960
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/30/2010
             | 
            
                +0.60 / +4.96%
             |             
            
                12.60
             |           
            
                12.70
             |               
            
                12.60
             |                           
            
                12.70
             | 
            
                12.70
             |                     
            
                12.70
             |                                 
            
                70,150
             |            
            
                 
             |                                       
         
    
        
            | 
                8/27/2010
             | 
            
                -0.50 / -3.97%
             |             
            
                12.30
             |           
            
                12.50
             |               
            
                12.00
             |                           
            
                12.10
             | 
            
                12.10
             |                     
            
                12.10
             |                                 
            
                95,760
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/26/2010
             | 
            
                0.00 / 0.00%
             |             
            
                12.70
             |           
            
                12.80
             |               
            
                12.10
             |                           
            
                12.60
             | 
            
                12.60
             |                     
            
                12.60
             |                                 
            
                121,460
             |            
            
                 
             |                                       
         
    
        
            | 
                8/25/2010
             | 
            
                -0.60 / -4.55%
             |             
            
                12.70
             |           
            
                12.70
             |               
            
                12.60
             |                           
            
                12.60
             | 
            
                12.60
             |                     
            
                12.60
             |                                 
            
                81,360
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/24/2010
             | 
            
                -0.60 / -4.35%
             |             
            
                13.40
             |           
            
                13.60
             |               
            
                13.20
             |                           
            
                13.20
             | 
            
                13.20
             |                     
            
                13.20
             |                                 
            
                87,730
             |            
            
                 
             |                                       
         
    
        
            | 
                8/23/2010
             | 
            
                -0.60 / -4.17%
             |             
            
                14.00
             |           
            
                14.00
             |               
            
                13.80
             |                           
            
                13.80
             | 
            
                13.80
             |                     
            
                13.80
             |                                 
            
                59,130
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/20/2010
             | 
            
                -0.10 / -0.69%
             |             
            
                14.70
             |           
            
                14.70
             |               
            
                13.90
             |                           
            
                14.40
             | 
            
                14.40
             |                     
            
                14.40
             |                                 
            
                62,740
             |            
            
                 
             |                                       
         
    
        
            | 
                8/19/2010
             | 
            
                -0.50 / -3.33%
             |             
            
                15.00
             |           
            
                15.10
             |               
            
                14.40
             |                           
            
                14.50
             | 
            
                14.50
             |                     
            
                14.50
             |                                 
            
                83,610
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/18/2010
             | 
            
                -0.70 / -4.46%
             |             
            
                15.30
             |           
            
                15.30
             |               
            
                15.00
             |                           
            
                15.00
             | 
            
                15.00
             |                     
            
                15.00
             |                                 
            
                149,290
             |            
            
                 
             |                                       
         
    
        
            | 
                8/17/2010
             | 
            
                0.00 / 0.00%
             |             
            
                15.70
             |           
            
                15.80
             |               
            
                15.10
             |                           
            
                15.70
             | 
            
                15.70
             |                     
            
                15.70
             |                                 
            
                101,470
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/16/2010
             | 
            
                +0.70 / +4.67%
             |             
            
                15.40
             |           
            
                15.70
             |               
            
                15.00
             |                           
            
                15.70
             | 
            
                15.70
             |                     
            
                15.70
             |                                 
            
                165,100
             |            
            
                 
             |                                       
         
    
        
            | 
                8/13/2010
             | 
            
                -0.20 / -1.32%
             |             
            
                14.60
             |           
            
                15.20
             |               
            
                14.50
             |                           
            
                15.00
             | 
            
                15.00
             |                     
            
                15.00
             |                                 
            
                180,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/12/2010
             | 
            
                -0.80 / -5.00%
             |             
            
                16.00
             |           
            
                16.00
             |               
            
                15.20
             |                           
            
                15.20
             | 
            
                15.20
             |                     
            
                15.20
             |                                 
            
                82,810
             |            
            
                 
             |                                       
         
    
        
            | 
                8/11/2010
             | 
            
                -0.10 / -0.62%
             |             
            
                16.60
             |           
            
                16.60
             |               
            
                15.50
             |                           
            
                16.00
             | 
            
                16.00
             |                     
            
                16.00
             |                                 
            
                106,660
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/10/2010
             | 
            
                -0.80 / -4.73%
             |             
            
                16.20
             |           
            
                16.30
             |               
            
                16.10
             |                           
            
                16.10
             | 
            
                16.10
             |                     
            
                16.10
             |                                 
            
                245,690
             |            
            
                 
             |                                       
         
    
        
            | 
                8/9/2010
             | 
            
                -0.80 / -4.52%
             |             
            
                17.50
             |           
            
                17.60
             |               
            
                16.90
             |                           
            
                16.90
             | 
            
                16.90
             |                     
            
                16.90
             |                                 
            
                213,390
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/6/2010
             | 
            
                -0.50 / -2.75%
             |             
            
                18.20
             |           
            
                18.20
             |               
            
                17.70
             |                           
            
                17.70
             | 
            
                17.70
             |                     
            
                17.70
             |                                 
            
                107,970
             |            
            
                 
             |                                       
         
    
        
            | 
                8/5/2010
             | 
            
                -0.20 / -1.09%
             |             
            
                18.60
             |           
            
                19.00
             |               
            
                18.20
             |                           
            
                18.20
             | 
            
                18.20
             |                     
            
                18.20
             |                                 
            
                77,610
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/4/2010
             | 
            
                -0.20 / -1.08%
             |             
            
                18.30
             |           
            
                18.50
             |               
            
                18.00
             |                           
            
                18.40
             | 
            
                18.40
             |                     
            
                18.40
             |                                 
            
                109,110
             |            
            
                 
             |                                       
         
    
        
            | 
                8/3/2010
             | 
            
                0.00 / 0.00%
             |             
            
                18.60
             |           
            
                19.10
             |               
            
                18.50
             |                           
            
                18.60
             | 
            
                18.60
             |                     
            
                18.60
             |                                 
            
                95,040
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/2/2010
             | 
            
                -0.40 / -2.11%
             |             
            
                19.00
             |           
            
                19.30
             |               
            
                18.60
             |                           
            
                18.60
             | 
            
                18.60
             |                     
            
                18.60
             |                                 
            
                152,540
             |            
            
                 
             |                                       
         
    
        
            | 
                7/30/2010
             | 
            
                0.00 / 0.00%
             |             
            
                18.90
             |           
            
                19.50
             |               
            
                18.60
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                19.00
             |                                 
            
                114,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/29/2010
             | 
            
                -0.10 / -0.52%
             |             
            
                19.20
             |           
            
                19.20
             |               
            
                18.60
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                19.00
             |                                 
            
                120,010
             |            
            
                 
             |                                       
         
    
        
            | 
                7/28/2010
             | 
            
                -0.90 / -4.50%
             |             
            
                19.40
             |           
            
                19.90
             |               
            
                19.10
             |                           
            
                19.10
             | 
            
                19.10
             |                     
            
                19.10
             |                                 
            
                146,770
             |  
            
                 
             |                                                              
             
    
         
    
    
 |