| 
                 
                    Closing price on 5/10/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    6.70 | 
                 
                
                    | High | 
                    6.70 | 
                 
                
                    | Low | 
                    6.50 | 
                     
                
                    | Volume | 
                    32,940 | 
                                 
                
                    | Split-adjusted Price | 
                    6.70 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PXT Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/10/2011
             | 
            
                0.00 / 0.00%
             |             
            
                6.70
             |           
            
                6.70
             |               
            
                6.50
             |                           
            
                6.70
             | 
            
                6.70
             |                     
            
                6.70
             |                                 
            
                32,940
             |            
            
                 
             |                                       
         
    
        
            | 
                5/9/2011
             | 
            
                +0.10 / +1.52%
             |             
            
                6.60
             |           
            
                6.70
             |               
            
                6.50
             |                           
            
                6.70
             | 
            
                6.70
             |                     
            
                6.70
             |                                 
            
                3,310
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/6/2011
             | 
            
                +0.10 / +1.54%
             |             
            
                6.50
             |           
            
                6.60
             |               
            
                6.40
             |                           
            
                6.60
             | 
            
                6.60
             |                     
            
                6.60
             |                                 
            
                25,610
             |            
            
                 
             |                                       
         
    
        
            | 
                5/5/2011
             | 
            
                -0.10 / -1.52%
             |             
            
                6.60
             |           
            
                6.70
             |               
            
                6.50
             |                           
            
                6.50
             | 
            
                6.50
             |                     
            
                6.50
             |                                 
            
                2,030
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/4/2011
             | 
            
                -0.20 / -2.94%
             |             
            
                6.70
             |           
            
                6.80
             |               
            
                6.50
             |                           
            
                6.60
             | 
            
                6.60
             |                     
            
                6.60
             |                                 
            
                19,030
             |            
            
                 
             |                                       
         
    
        
            | 
                4/29/2011
             | 
            
                -0.10 / -1.45%
             |             
            
                6.80
             |           
            
                6.90
             |               
            
                6.60
             |                           
            
                6.80
             | 
            
                6.80
             |                     
            
                6.80
             |                                 
            
                7,990
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/28/2011
             | 
            
                -0.10 / -1.43%
             |             
            
                7.00
             |           
            
                7.00
             |               
            
                6.90
             |                           
            
                6.90
             | 
            
                6.90
             |                     
            
                6.90
             |                                 
            
                5,940
             |            
            
                 
             |                                       
         
    
        
            | 
                4/27/2011
             | 
            
                0.00 / 0.00%
             |             
            
                7.20
             |           
            
                7.20
             |               
            
                6.70
             |                           
            
                7.00
             | 
            
                7.00
             |                     
            
                7.00
             |                                 
            
                10,760
             |  
            
                 
             |                                                              
             
    
        			
            | 
                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
             |  
            
                 
             |                                                              
             
    
         
    
    
 |