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                    Closing price on 5/7/2013
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        |           
                
                    | Open | 9.00 |  
                    | High | 9.10 |  
                    | Low | 8.90 |  
                    | Volume | 23,502 |  
                    | Split-adjusted Price | 4.76 |  
                
             | 
 |  SD6 Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 5/7/2013 | -0.20 / -2.20% | 9.00 | 9.10 | 8.90 | 8.90 | 9.04 | 4.76 | 23,502 |   |  
            | 5/6/2013 | 0.00 / 0.00% | 9.00 | 9.20 | 9.00 | 9.10 | 9.11 | 4.87 | 54,860 |   |  			
            | 5/3/2013 | +0.20 / +2.25% | 8.90 | 9.10 | 8.90 | 9.10 | 9.00 | 4.87 | 54,320 |   |  
            | 5/2/2013 | 0.00 / 0.00% | 8.80 | 8.90 | 8.80 | 8.90 | 8.89 | 4.76 | 9,000 |   |  			
            | 4/26/2013 | +0.10 / +1.14% | 8.80 | 8.90 | 8.80 | 8.90 | 8.86 | 4.76 | 46,700 |   |  
            | 4/25/2013 | 0.00 / 0.00% | 8.70 | 8.90 | 8.70 | 8.80 | 8.83 | 4.71 | 40,400 |   |  			
            | 4/24/2013 | 0.00 / 0.00% | 8.80 | 8.90 | 8.80 | 8.80 | 8.80 | 4.71 | 25,600 |   |  
            | 4/23/2013 | 0.00 / 0.00% | 8.90 | 8.90 | 8.80 | 8.80 | 8.82 | 4.71 | 68,700 |   |  			
            | 4/22/2013 | -0.20 / -2.22% | 9.30 | 9.30 | 8.80 | 8.80 | 8.85 | 4.71 | 36,700 |   |  
            | 4/18/2013 | -0.10 / -1.10% | 9.00 | 9.10 | 8.90 | 9.00 | 9.02 | 4.82 | 45,400 |   |  			
            | 4/17/2013 | +0.30 / +3.41% | 8.90 | 9.50 | 8.90 | 9.10 | 9.19 | 4.87 | 204,900 |   |  
            | 4/16/2013 | 0.00 / 0.00% | 8.70 | 8.80 | 8.60 | 8.80 | 8.66 | 4.71 | 58,200 |   |  			
            | 4/15/2013 | -0.10 / -1.12% | 8.90 | 8.90 | 8.70 | 8.80 | 8.81 | 4.71 | 52,000 |   |  
            | 4/12/2013 | 0.00 / 0.00% | 8.90 | 8.90 | 8.80 | 8.90 | 8.84 | 4.76 | 82,356 |   |  			
            | 4/11/2013 | +0.10 / +1.14% | 8.90 | 9.00 | 8.80 | 8.90 | 8.90 | 4.76 | 82,700 |   |  
            | 4/10/2013 | -0.30 / -3.30% | 9.00 | 9.00 | 8.70 | 8.80 | 8.88 | 4.71 | 145,166 |   |  			
            | 4/9/2013 | 0.00 / 0.00% | 9.10 | 9.20 | 9.00 | 9.10 | 9.10 | 4.87 | 53,790 |   |  
            | 4/8/2013 | +0.40 / +4.60% | 8.90 | 9.20 | 8.90 | 9.10 | 9.06 | 4.87 | 235,500 |   |  			
            | 4/5/2013 | -0.10 / -1.14% | 9.00 | 9.00 | 8.70 | 8.70 | 8.79 | 4.66 | 104,600 |   |  
            | 4/4/2013 | -0.10 / -1.12% | 8.80 | 9.00 | 8.70 | 8.80 | 8.86 | 4.71 | 73,000 |   |  			
            | 4/3/2013 | +0.10 / +1.14% | 9.00 | 9.00 | 8.70 | 8.90 | 8.82 | 4.76 | 74,010 |   |  
            | 4/2/2013 | -0.40 / -4.35% | 9.00 | 9.20 | 8.80 | 8.80 | 8.98 | 4.71 | 229,600 |   |  			
            | 4/1/2013 | 0.00 / 0.00% | 9.10 | 9.30 | 9.00 | 9.20 | 9.16 | 4.92 | 116,500 |   |  
            | 3/29/2013 | +0.30 / +3.37% | 8.60 | 9.20 | 8.50 | 9.20 | 8.96 | 4.92 | 220,400 |   |  			
            | 3/28/2013 | -0.20 / -2.20% | 9.00 | 9.00 | 8.70 | 8.90 | 8.88 | 4.76 | 75,900 |   |  
            | 3/27/2013 | 0.00 / 0.00% | 8.90 | 9.10 | 8.90 | 9.10 | 8.98 | 4.87 | 52,600 |   |  			
            | 3/26/2013 | +0.20 / +2.25% | 9.00 | 9.30 | 9.00 | 9.10 | 9.06 | 4.87 | 181,040 |   |  
            | 3/25/2013 | +0.40 / +4.71% | 8.50 | 9.00 | 8.50 | 8.90 | 8.68 | 4.76 | 231,200 |   |  			
            | 3/22/2013 | -0.10 / -1.16% | 8.50 | 8.50 | 8.30 | 8.50 | 8.47 | 4.55 | 50,000 |   |  
            | 3/21/2013 | +0.10 / +1.18% | 8.60 | 8.60 | 8.40 | 8.60 | 8.53 | 4.60 | 59,500 |   |  |