| 
                 
                    Closing price on 4/18/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    7.30 | 
                 
                
                    | High | 
                    7.50 | 
                 
                
                    | Low | 
                    7.20 | 
                     
                
                    | Volume | 
                    15,850 | 
                                 
                
                    | Split-adjusted Price | 
                    7.50 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PXT Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                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
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/23/2011
             | 
            
                +0.10 / +1.12%
             |             
            
                8.80
             |           
            
                9.00
             |               
            
                8.80
             |                           
            
                9.00
             | 
            
                9.00
             |                     
            
                9.00
             |                                 
            
                31,540
             |            
            
                 
             |                                       
         
    
        
            | 
                3/22/2011
             | 
            
                -0.10 / -1.11%
             |             
            
                9.00
             |           
            
                9.00
             |               
            
                8.90
             |                           
            
                8.90
             | 
            
                8.90
             |                     
            
                8.90
             |                                 
            
                27,130
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/21/2011
             | 
            
                -0.10 / -1.10%
             |             
            
                9.10
             |           
            
                9.10
             |               
            
                8.90
             |                           
            
                9.00
             | 
            
                9.00
             |                     
            
                9.00
             |                                 
            
                65,730
             |            
            
                 
             |                                       
         
    
        
            | 
                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
             |  
            
                 
             |                                                              
             
    
         
    
    
 |