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                    Closing price on 2/18/2013
                 |  |  
    
        |           
                
                    | Open | 8.80 |  
                    | High | 9.40 |  
                    | Low | 8.70 |  
                    | Volume | 90,760 |  
                    | Split-adjusted Price | 4.87 |  
                
             | 
 |  SD6 Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 2/18/2013 | +0.30 / +3.41% | 8.80 | 9.40 | 8.70 | 9.10 | 8.90 | 4.87 | 90,760 |   |  
            | 2/8/2013 | 0.00 / 0.00% | 8.70 | 8.80 | 8.50 | 8.80 | 8.71 | 4.71 | 127,900 |   |  			
            | 2/7/2013 | 0.00 / 0.00% | 8.90 | 8.90 | 8.60 | 8.80 | 8.71 | 4.71 | 34,500 |   |  
            | 2/6/2013 | +0.10 / +1.15% | 8.80 | 8.80 | 8.60 | 8.80 | 8.66 | 4.71 | 56,300 |   |  			
            | 2/5/2013 | +0.10 / +1.16% | 8.60 | 8.80 | 8.60 | 8.70 | 8.63 | 4.66 | 119,400 |   |  
            | 2/4/2013 | +0.40 / +4.88% | 8.10 | 8.80 | 8.10 | 8.60 | 8.55 | 4.60 | 190,400 |   |  			
            | 2/1/2013 | +0.10 / +1.23% | 8.20 | 8.30 | 8.10 | 8.20 | 8.13 | 4.39 | 134,830 |   |  
            | 1/31/2013 | 0.00 / 0.00% | 7.90 | 8.20 | 7.90 | 8.10 | 8.11 | 4.33 | 182,890 |   |  			
            | 1/30/2013 | -0.10 / -1.22% | 8.20 | 8.40 | 8.10 | 8.10 | 8.17 | 4.33 | 90,600 |   |  
            | 1/29/2013 | +0.50 / +6.49% | 7.70 | 8.30 | 7.70 | 8.20 | 8.07 | 4.39 | 260,750 |   |  			
            | 1/28/2013 | +0.40 / +5.48% | 7.40 | 7.90 | 7.40 | 7.70 | 7.70 | 4.12 | 171,000 |   |  
            | 1/25/2013 | +0.10 / +1.39% | 7.20 | 7.40 | 7.10 | 7.30 | 7.32 | 3.91 | 98,600 |   |  			
            | 1/24/2013 | +0.40 / +5.88% | 6.90 | 7.20 | 6.80 | 7.20 | 7.01 | 3.85 | 109,220 |   |  
            | 1/23/2013 | +0.10 / +1.49% | 6.60 | 6.90 | 6.50 | 6.80 | 6.66 | 3.64 | 103,266 |   |  			
            | 1/22/2013 | +0.10 / +1.52% | 6.50 | 6.70 | 6.40 | 6.70 | 6.59 | 3.59 | 126,400 |   |  
            | 1/21/2013 | -0.30 / -4.35% | 6.90 | 7.00 | 6.60 | 6.60 | 6.76 | 3.53 | 75,100 |   |  			
            | 1/18/2013 | +0.10 / +1.47% | 6.80 | 7.10 | 6.70 | 6.90 | 6.88 | 3.69 | 112,882 |   |  
            | 1/17/2013 | +0.20 / +3.03% | 6.60 | 7.00 | 6.50 | 6.80 | 6.82 | 3.64 | 245,900 |   |  			
            | 1/16/2013 | +0.30 / +4.76% | 6.50 | 6.90 | 6.40 | 6.60 | 6.63 | 3.53 | 116,268 |   |  
            | 1/15/2013 | 0.00 / 0.00% | 6.40 | 6.60 | 6.30 | 6.30 | 6.41 | 3.37 | 33,900 |   |  			
            | 1/14/2013 | 0.00 / 0.00% | 6.30 | 6.30 | 6.20 | 6.30 | 6.29 | 3.37 | 22,300 |   |  
            | 1/11/2013 | 0.00 / 0.00% | 6.40 | 6.50 | 6.30 | 6.30 | 6.36 | 3.37 | 39,700 |   |  			
            | 1/10/2013 | +0.10 / +1.61% | 6.20 | 6.30 | 6.10 | 6.30 | 6.21 | 3.37 | 19,000 |   |  
            | 1/9/2013 | -0.20 / -3.13% | 6.50 | 6.60 | 6.20 | 6.20 | 6.44 | 3.32 | 151,582 |   |  			
            | 1/8/2013 | -0.20 / -3.03% | 6.30 | 6.50 | 6.30 | 6.40 | 6.39 | 3.42 | 52,500 |   |  
            | 1/7/2013 | -0.20 / -2.94% | 6.80 | 6.80 | 6.40 | 6.60 | 6.57 | 3.53 | 32,900 |   |  			
            | 1/4/2013 | +0.20 / +3.03% | 6.50 | 6.80 | 6.40 | 6.80 | 6.56 | 3.64 | 50,680 |   |  
            | 1/3/2013 | -0.10 / -1.49% | 6.70 | 7.00 | 6.30 | 6.60 | 6.59 | 3.53 | 20,580 |   |  			
            | 1/2/2013 | +0.30 / +4.69% | 6.40 | 6.70 | 6.40 | 6.70 | 6.56 | 3.59 | 42,300 |   |  
            | 12/28/2012 | +0.10 / +1.59% | 6.40 | 6.40 | 6.10 | 6.40 | 6.26 | 3.42 | 62,200 |   |  |