| 
                 
                    Closing price on 4/13/2007
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    41.60 | 
                 
                
                    | High | 
                    42.00 | 
                 
                
                    | Low | 
                    41.00 | 
                     
                
                    | Volume | 
                    1,700 | 
                                 
                
                    | Split-adjusted Price | 
                    3.35 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
STP Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                4/13/2007
             | 
            
                -0.50 / -1.18%
             |             
            
                41.60
             |           
            
                42.00
             |               
            
                41.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                3.35
             |                                 
            
                1,700
             |            
            
                 
             |                                       
         
    
        
            | 
                4/12/2007
             | 
            
                +1.50 / +3.66%
             |             
            
                40.90
             |           
            
                44.00
             |               
            
                40.00
             |                           
            
                42.50
             | 
            
                42.50
             |                     
            
                3.39
             |                                 
            
                8,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/11/2007
             | 
            
                +1.00 / +2.50%
             |             
            
                40.20
             |           
            
                42.00
             |               
            
                40.20
             |                           
            
                41.00
             | 
            
                41.00
             |                     
            
                3.27
             |                                 
            
                7,200
             |            
            
                 
             |                                       
         
    
        
            | 
                4/10/2007
             | 
            
                0.00 / 0.00%
             |             
            
                39.80
             |           
            
                40.00
             |               
            
                39.80
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                3.19
             |                                 
            
                1,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/9/2007
             | 
            
                -2.20 / -5.21%
             |             
            
                39.60
             |           
            
                42.20
             |               
            
                39.00
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                3.19
             |                                 
            
                4,600
             |            
            
                 
             |                                       
         
    
        
            | 
                4/6/2007
             | 
            
                +0.10 / +0.24%
             |             
            
                42.00
             |           
            
                43.00
             |               
            
                40.00
             |                           
            
                42.20
             | 
            
                42.20
             |                     
            
                3.36
             |                                 
            
                1,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/5/2007
             | 
            
                -2.50 / -5.61%
             |             
            
                42.40
             |           
            
                46.00
             |               
            
                42.10
             |                           
            
                42.10
             | 
            
                42.10
             |                     
            
                3.36
             |                                 
            
                1,700
             |            
            
                 
             |                                       
         
    
        
            | 
                4/4/2007
             | 
            
                0.00 / 0.00%
             |             
            
                42.40
             |           
            
                44.60
             |               
            
                40.20
             |                           
            
                44.60
             | 
            
                44.60
             |                     
            
                3.56
             |                                 
            
                4,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/3/2007
             | 
            
                -1.90 / -4.09%
             |             
            
                44.60
             |           
            
                44.60
             |               
            
                44.60
             |                           
            
                44.60
             | 
            
                44.60
             |                     
            
                3.56
             |                                 
            
                300
             |            
            
                 
             |                                       
         
    
        
            | 
                4/2/2007
             | 
            
                +0.50 / +1.09%
             |             
            
                46.10
             |           
            
                48.00
             |               
            
                42.10
             |                           
            
                46.50
             | 
            
                46.50
             |                     
            
                3.71
             |                                 
            
                2,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/30/2007
             | 
            
                +3.40 / +7.98%
             |             
            
                46.00
             |           
            
                46.80
             |               
            
                46.00
             |                           
            
                46.00
             | 
            
                46.00
             |                     
            
                3.67
             |                                 
            
                14,200
             |            
            
                 
             |                                       
         
    
        
            | 
                3/29/2007
             | 
            
                -0.40 / -0.93%
             |             
            
                42.60
             |           
            
                42.60
             |               
            
                42.60
             |                           
            
                42.60
             | 
            
                42.60
             |                     
            
                3.40
             |                                 
            
                3,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/28/2007
             | 
            
                +1.80 / +4.37%
             |             
            
                38.80
             |           
            
                43.00
             |               
            
                37.40
             |                           
            
                43.00
             | 
            
                43.00
             |                     
            
                3.43
             |                                 
            
                5,500
             |            
            
                 
             |                                       
         
    
        
            | 
                3/27/2007
             | 
            
                -4.20 / -9.25%
             |             
            
                41.50
             |           
            
                43.80
             |               
            
                41.20
             |                           
            
                41.20
             | 
            
                41.20
             |                     
            
                3.28
             |                                 
            
                4,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/26/2007
             | 
            
                -3.60 / -7.35%
             |             
            
                45.70
             |           
            
                47.00
             |               
            
                45.40
             |                           
            
                45.40
             | 
            
                45.40
             |                     
            
                3.62
             |                                 
            
                2,300
             |            
            
                 
             |                                       
         
    
        
            | 
                3/23/2007
             | 
            
                -0.50 / -1.01%
             |             
            
                50.40
             |           
            
                51.30
             |               
            
                48.00
             |                           
            
                49.00
             | 
            
                49.00
             |                     
            
                3.91
             |                                 
            
                4,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/22/2007
             | 
            
                -4.50 / -8.33%
             |             
            
                51.30
             |           
            
                53.00
             |               
            
                49.00
             |                           
            
                49.50
             | 
            
                49.50
             |                     
            
                3.95
             |                                 
            
                9,500
             |            
            
                 
             |                                       
         
    
        
            | 
                3/21/2007
             | 
            
                -0.50 / -0.92%
             |             
            
                53.00
             |           
            
                54.00
             |               
            
                52.00
             |                           
            
                54.00
             | 
            
                54.00
             |                     
            
                4.30
             |                                 
            
                7,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/20/2007
             | 
            
                +0.10 / +0.18%
             |             
            
                54.40
             |           
            
                59.00
             |               
            
                54.00
             |                           
            
                54.50
             | 
            
                54.50
             |                     
            
                4.34
             |                                 
            
                15,500
             |            
            
                 
             |                                       
         
    
        
            | 
                3/19/2007
             | 
            
                -1.60 / -2.86%
             |             
            
                54.40
             |           
            
                54.40
             |               
            
                54.40
             |                           
            
                54.40
             | 
            
                54.40
             |                     
            
                4.34
             |                                 
            
                20,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/16/2007
             | 
            
                +4.90 / +9.59%
             |             
            
                49.50
             |           
            
                56.00
             |               
            
                46.00
             |                           
            
                56.00
             | 
            
                56.00
             |                     
            
                4.46
             |                                 
            
                21,600
             |            
            
                 
             |                                       
         
    
        
            | 
                3/15/2007
             | 
            
                -5.60 / -9.88%
             |             
            
                51.10
             |           
            
                51.10
             |               
            
                51.10
             |                           
            
                51.10
             | 
            
                51.10
             |                     
            
                4.07
             |                                 
            
                3,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/14/2007
             | 
            
                -1.30 / -2.24%
             |             
            
                56.70
             |           
            
                58.00
             |               
            
                56.70
             |                           
            
                56.70
             | 
            
                56.70
             |                     
            
                4.52
             |                                 
            
                5,300
             |            
            
                 
             |                                       
         
    
        
            | 
                3/13/2007
             | 
            
                -6.30 / -9.80%
             |             
            
                63.00
             |           
            
                70.70
             |               
            
                57.90
             |                           
            
                58.00
             | 
            
                58.00
             |                     
            
                4.62
             |                                 
            
                15,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/12/2007
             | 
            
                +5.80 / +9.91%
             |             
            
                64.30
             |           
            
                64.30
             |               
            
                64.30
             |                           
            
                64.30
             | 
            
                64.30
             |                     
            
                5.13
             |                                 
            
                28,700
             |            
            
                 
             |                                       
         
    
        
            | 
                3/9/2007
             | 
            
                +5.30 / +9.96%
             |             
            
                58.50
             |           
            
                58.50
             |               
            
                58.50
             |                           
            
                58.50
             | 
            
                58.50
             |                     
            
                4.66
             |                                 
            
                9,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/8/2007
             | 
            
                +4.80 / +9.92%
             |             
            
                53.20
             |           
            
                53.20
             |               
            
                53.20
             |                           
            
                53.20
             | 
            
                53.20
             |                     
            
                4.24
             |                                 
            
                2,700
             |            
            
                 
             |                                       
         
    
        
            | 
                3/7/2007
             | 
            
                +4.40 / +10.00%
             |             
            
                48.40
             |           
            
                48.40
             |               
            
                48.40
             |                           
            
                48.40
             | 
            
                48.40
             |                     
            
                3.86
             |                                 
            
                8,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/6/2007
             | 
            
                +3.50 / +8.64%
             |             
            
                42.00
             |           
            
                44.00
             |               
            
                42.00
             |                           
            
                44.00
             | 
            
                44.00
             |                     
            
                3.51
             |                                 
            
                20,800
             |            
            
                 
             |                                       
         
    
        
            | 
                3/5/2007
             | 
            
                +1.00 / +2.53%
             |             
            
                39.50
             |           
            
                43.40
             |               
            
                38.50
             |                           
            
                40.50
             | 
            
                40.50
             |                     
            
                3.23
             |                                 
            
                30,000
             |  
            
                 
             |                                                              
             
    
         
    
    
 |